61. Eijt, S.W., R. Currat, J.E. Lorenzo, S. Katano, P. Saint-Gregoire, B. Hennion and Y. Vysochanskii, 1997. Soft mode behaviour of incommensurate Sn2P2Se6: An inelastic neutron scattering study. Ferroelectrics, 202: 121-129.
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Aliouane, N., T. Badeche, Y. Gagou, E. Nigrelli and P. Saint-Gregoire, 2000. Synthesis and phase transitions of iron phosphate. Ferroelectrics, 241: 255-262.
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Aliouane, N., Y. Gagou, E. Elkaim, T. Badeche and J.P. Lauriat, 2002. Structural evolution of iron phosphate as a function of temperature. Ferroelectrics, 269: 279-284.
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Almairac, R., H. Aarab and P. Saint-Gregoire, 1992. Kinetics of the Incommensurate to Commensurate transition in the solid solution (NH₄)_1-x (BeF₄) _x (SO₄). Phase Transitions, 37: 165-177.
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Almairac, R., M. Siali, S. Vilminot, P. Saint-Gregoire, G. Delplanque and G. Barre, 1985. Phase incommensurable dans le compose mixte (NH4) 2(BeF4)0,82(SO4)0,18. J. Phys. Lett., 46: L1123-L1131.
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Astito, A., R. Almairac, J. Lapasset, P. Saint-Gregoire and J. Moret, 1993. Phase transitions and domain structure in a doubly unstable compound. Ferroelectrics, 141: 19-24.
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Astito, A., R. Almairac, J. Moret, P. Saint-Gregoire and J. Lapasset, 1994. Coupled instabilities in the solid solution [P(CH₃)₄]₂(CuCI₄)_1-x(CuBr₄)_x. Ferroelectrics, 155: 287-291.
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Augereau, F., G. Despaux and P. Saint-Gregoire, 2003. Imaging ferroic domains structures with an acoustic microscope: Example of PPLN. Ferroelectrics, 290: 29-38.
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Bachheimer, J.P., B. Berge, G. Dolino, P. Saint-Gregoire and C.M.E. Zeyen, 1984. Calorimetric and neutron scattering studies of the incommensurate phase of berlinite AlPO₄. Solid State Commun., 51: 55-58.
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Badeche, T., Y. Gagou, C. Roucau, M.A. Fremy, D. Mezzane and P. Saint-Gregoire, 2003. HREM Study of the room temperature phase of PbK₂LiNb₅O₁₅. Ferroelectrics, 290: 83-90.
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Badeche, T., Y. Gagou, N. Aliouane, O.A. Aktsipetrov, M.H. Pischedda and P. Saint-Gregoire, 2001. Structural characterization of PZT thin films and related properties. Ferroelectrics, 254: 403-410.
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Barthes-Regis, M., R. Almairac, P. Saint-Gregoire, C. Filippini, U. Steigenberger J. Nouet and J.Y. Gesland, 1983. Temperature dependence of the wave vector of the incommensurate modulation in two BaMnF4 crystals grown by different techniques, neutron and X-ray measurements. J. Phys. Lett., 44: L829-L835.
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Belboukhari, A., D. Mezzane, Y. Gagou, M. Elmarssi, I. Lukyanchuk, A. Zegzouti and P. Saint-Gregoire, 2010. Dielectric properties of new ferroelectric lead potassium niobate Pb_0.9K_0.2Nb₂O₆. M. J. Cond. Matter, 12: 103-107.
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Bianchi, U., W. Kleemann and P. Saint-Gregoire, 1991. Linear birefringence studies of incommensurate systems: II. KfeF₄. Phase Transitions, 36: 155-164.
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Choukri, E., Y. Gagou, A. Belboukhari, G. Erramo and M.A. Fremy et al., 2011. Phase diagram and dielectric properties of ferroelectrics ceramics Pb_2-xK_1+xLi_xNb₅O₁₅. Superlattices Microstruct., 49: 300-306.
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Choukri, E., Y. Gagou, D. Mezzane, M. Elmarssi and Z. Abkhar et al., 2010. Phase diagram of TTB ferroelectric compounds Pb_1-xK_2xNb₂O₆. J. Cond. Matter, 12: 81-85.

Choukri, E., Y. Gagou, D. Mezzane, Z. Abkhar and R. El Moznine et al., 2011. Dielectric and structural properties of diffuse ferroelectric phase transition in Pb_1.85K_1.15Li_0.15Nb₅O₁₅ ceramic. Eur. Phys. J. Applied Phys., 53: 20901-20901.
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Choukri, E., Z. Abkhar, Y. Gagou, M.A. Fremy and J.L. Dellis et al., 2010. Dielectric properties of lead potassium lithium niobate (Pb_1.85K_1.15Li_0.15Nb₅O₁₅) with Tetragonal Tungsten Bronze (TTB) type structure. J. Cond. Matter, 12: 86-91.
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Devreese, J.T., 1981. Recent Developments in Condensed Matter Physics: Metals, Disordered Systems, Surfaces and Interfaces. Plenum Press, New York, USA.

Enjalbert, R., J. Galy, Y. Vysochanskii, A. Ouedraogo and P. Saint-Gregoire, 1999. Structural study of the ferroelectric instability in Sn₂P₂Se₆. Eur. Phys. J. B Condensed Matter Complex Syst., 8: 169-177.
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Gagou, Y., A. Menny, J. Belhadi, M.A. Fremy and D. Mezzane et al., 2012. Pulsed laser deposition of TTB-type materials thin films example of Pb₂KNb₅O₁₅ (PKN) and GdK₂Nb₅O₁₅ (GKN). Res. J. Nanosci. Nanotechnol., 2: 24-30.
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Gagou, Y., C. Muller, M.A. Fremy, E. Elkaim and P. Saint-Gregoire, 2004. Structural study of ferroelectric and paraelectric phases of PbK₂LiNb₅O₁₅. Phys. Stat. Sol. b, 241: 2629-2938.
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Gagou, Y., C. Muller, N. Aliouane, E. Elkaim, G. Nihoul and P. Saint-Gregoire, 2002. Structural and electrical properties of the new ferroelectric PbK₂LiNb₅O₁₅. Ferroelectrics, 268: 417-422.
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Gagou, Y., D. Mezzane, N. Aliouane, J. Fabry and T. Badeche et al., 2001. Structural change and some associated anomalies in the ferroelectric PbK₂LiNb₅O₁₅. Ferroelectrics, 251: 131-137.
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Gagou, Y., D. Mezzane, N. Aliouane, T. Badeche, M. Elaatmani, M.H. Pischedda and P. Saint-Gregoire, 2001. A new ferroelectric compound: PbK₂LiNb₅O₁₅. Ferroelectrics, 254: 197-204.
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Gagou, Y., E. Padayodi, K.E. Atcholi and P. Saint-Gregoire, 2008. Study of the mechanical behaviour of clay, a natural material for house construction. Int. Sci. J. Alter. Energy Ecol., 6: 187-193.
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Gagou, Y., M.A. Fremy, T. Badeche, D. Mezzane, H. Choukri and P. Saint-Gregoire, 2008. Ionic conduction properties in PbK₂LiNb₅O₁₅. Ferroelectrics, 371: 17-20.
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Jorio, A., M.S.S. Dantas, N.L. Speziali, M.A. Pimenta, C.B. Pinheiro, I. Lukyanchuk and P. Saint-Gregoire, 2004. Structural and dynamical aspects of structural phase transitions on incommensurate A₂BX₄ compounds. Ferroelectrics, 305: 75-78.
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Jorio, A., P. Saint-Gregoire and M. Pimenta, 2000. High-temperature phase transitions in incommensurate Rb₂WO₄. J. Phys.: Condens. Matter, 12: 9307-9315.
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Jorio, A., R. Currat, D.A.A. Myles, G.J. McIntyre, I.P. Aleksandrova, J.M. Kiat and P. Saint-Gregoire, 2000. Ferroelastic phase transition in Cs₃Bi₂I₉: A neutron diffraction study. Phys. Rev. B, 61: 3857-3862.
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Kroupa, J., W. Schranz, A. Fuith, H. Warhanek and P. Saint-Gregoire, 1991. Optical study of the phase transitions in [N(CH₃)₄]₂CoCl₄ and [N(CD₃)₄]₂ZnCl₄. J. Phys. Condens. Matter, 3: 5975-5975.
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Kroupa, J., W. Schranz, A. Fuith, H. Warhanek and P. Saint-Gregoire, 1992. Study of the Linear Birefringence and Domain Structure in {N(CH₃)₄}₂CoCl₄ and {N(CD₃)₄}₂ZnC_l4. Ferroelectrics, 125: 165-170.
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Luk'yanchuk, I., A. Jorio and P. Saint-Gregoire, 2000. Thermodynamics of the incommensurate state in Rb₂WO₄: The Lifshitz point in A₂BX₄ compounds. Phys. Rev. B, 61: 3147-3150.
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Lukyanchuk, I. and P. Saint-Gregoire, 2002. Stress-induced change of the Lifshitz point type in A₂BX₄ compounds. J. Phys. Condens. Matter, 14: 7487-7491.
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Mahoui, A., J. Lapasset, D.G. Sannikov, J. Moret and P. Saint-Gregoire, 1996. On the ordering in [(C₂H₅)₄ N] ₂ Cu Cl₄ crystal: An X-ray study and theoretical considerations. Z. Phys. B, 99: 543-549.
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Mahoui, A., J. Lapasset, J. Moret and P. Saint-Gregoire, 1996. Tetraethylammonium Tetramethylammonium Tetrachlorocuprate (II) [(C₂H₅)₄N][(CH₃)₄N] [CuCl₄]. Acta Cryst., C52: 2674-2676.
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Mahoui, A., J. Lapasset, J. Moret and P. Saint-Gregoire, 1996. Bis(tetraethylammonium) tetrachlorometallates [(C₂H₅)₄N]₂[MCl₄], where M = Hg, Cd, Zn. Acta Crystallogr. Sect. C: Cryst. Struct. Commun., 52: 2671-2674.
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Mahoui, A., J. Lapasset, J. Moret, M. Lopez and P. Saint-Gregoire, 1996. Structural changes in tetraethylammonium copper chloride. Ferroelectrics, 175: 79-84.
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Marion, G., R. Almairac, M. Ribet, U. Steigenberger and C. Vettier, 1984. Temperature-pressure phase diagram of deuterated tetramethylammonium tetrachlorozincate. J. Phys., 45: 929-938.
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Mezzane, D., M. Bziouet and P. Saint-Gregoire, 1990. Influence of thermal history on dielectric anomalies in incommensurate (TMA)₂ZnCl₄. Ferroelectrics Lett., 11: 79-88.
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Mezzane, D., Y. Gagou, N. Aliouane, A. Flory, T. Badeche, A. Zegzouti and P. Saint-Gregoire, 2001. A DMA study of the ferroelectric-ferroelastic structure change in PbK₂LiNb₅O₁₅. Izvestija Akademii Nauk, Serija Fizicheskaja, 65: 1134-1137.
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Moreira, R.L., M.A.S. Oliveira, P. Saint-Gregoire and J.Y. Gesland, 2006. Ferroelastic transitions and cracks in Li₃ThF₇ single crystals Ferroelectrics, 334: 57-65.
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Oualla, M., A. Zegzouti, M. Elaatmani, M. Daoud, D. Mezzane, Y. Gagou and P. Saint-Gregoire, 2003. New gadolinium based ferroelectric phases derived from the Tetragonal Tungsten Bronze (TTB). Ferroelectrics, 291: 133-139.
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Ouedraogo, A., I. Lukyanchuk and P. Saint-Gregoire, 2004. Polarization rotation in the incommensurate phase of Sn₂P₂ (Se_xS_1-x)₆. Ferroelectrics, 302: 137-141.
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Pelaiz Barranco, A., Y. Mendez Gonzalez, D.C. Arnold, P. Saint-Gregoire, D.J. Keeble, 2012. Incorporation of lanthanide ions in lead titanate. J. Mater. Sci., 47: 1094-1099.
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Perez, A., H. Ottavi and P. Saint-Gregoire, 2000. Lattice spin model AB₁B₂. Comput. Mater. Sci., 18: 167-176.
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Regis, M., M. Candille, P. Saint-Gregoire, 1980. Optical study of the structural phase transition of BaMnF₄. J. Phys. Lett., 41: 423-425.
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Saint-Gregoire, P. F.J. Schafer, W. Kleemann, J. Durand and A. Goiffon, 1984. Birefringence study of the α-β transformation of berlinite, AlPO₄. J. Phys. C, 17: 1375-1375.
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Saint-Gregoire, P. and I. Lukyanchuk, 1997. Domain textures of multi-q modulated phases: Example of quartz. Ferroelectrics, 191: 267-273.

Saint-Gregoire, P. and A. Perez, 1983. Possible incommensurate phase in KFeF₄. Z. Krist., 163: 135-138.
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Saint-Gregoire, P. and A. Perez, 1989. Prediction of modulation wave vector rotation in incommensurate crystals under field or stress. Proceedings of the 7th International Meeting of Ferroelectricity, September, 1989, Saarbrucken, Germany -.

Saint-Gregoire, P. and I. Luk'yanchuk, 1999. Comment on inhomogeneities and birefringence in quartz. J. Phys.: Condens. Matter, 11: 8169-8173.
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Saint-Gregoire, P. and V. Janovec, 1989. Analysis of linear defects in triply-incommensurate phase of quartz-type. Ferroelectrics, 97: 299-311.
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Saint-Gregoire, P. and V. Janovec, 1989. Modulated Phases in Crystals: Symmetries of Walls and Wall Lattices: Example of Quartz. In: Lecture Notes in Physics, Barthes, M. and J. Leon (Eds.). Springer Verlag, USA.

Saint-Gregoire, P., 1999. Role of the Coupling between Strains and Order Parameter Gradient in Crystals. Phase Trans., 67: 587-615.
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Saint-Gregoire, P., 1987. Intrinsic Defects in Insulating Incommensurate Crystals. In: Incommensurate Crystals, Liquid Crystals and Quasi Crystals, Scott, J.F. and N.A. Clark (Eds.). Plenum Press, USA., pp 151-162.

Saint-Gregoire, P., 1991. Change of domain structure at lock-in transitions. Phase Transitions, 30: 255-258.
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Saint-Gregoire, P., 1995. Ferroelastic incommensurate phases. Key Eng. Mater., 101-102: 237-284.
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Saint-Gregoire, P., 1996. On improper ferroelastics among incommensurate materials. Ferroelectrics, 175: 25-39.
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Saint-Gregoire, P., 1997. On mesoscopic structure of incommensurate phases: Domain textures and textural blocks. Ferroelectrics, 192: 61-70.
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Saint-Gregoire, P., 2000. On the anomalous light scattering in quartz: A critical overview and recent results. Ferroelectrics, 240: 1405-1412.
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Saint-Gregoire, P., 2008. Overview on fields related to renewable energies relevant for north south collaborations. Int. Sci. J. Alter. Energy Ecol., 5: 11-20.
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Saint-Gregoire, P., E. Snoeck and N. Aliouane, 2001. On the evolution of texture between α and β phases in quartz: Aspects relevant with the problem of the anomalous light scattering. Ferroelectrics, 252: 1-9.
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Saint-Gregoire, P., E. Snoeck, C. Roucau, I. Lukyanchuk and V. Janovec. 1996. A novel type of incommensurate phase in quartz: The elongated-triangle phase. JETP Lett., 64: 410-415.
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Saint-Gregoire, P., E. Snoeck, C. Roucau, I. Lukyanchuk and V. Janovec. 1996. A novel type of incommensurate phase in quartz: The elongated-triangle phase. JETP Lett., 64: 410-415.
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Saint-Gregoire, P., E. Snoeck, C. Roucau, N. Aliouane, I. Luk'yanchuk, 2003. Anomalous light scattering in quartz: Ferroelastic versus metastable EQT blocks models. Ferroelectrics, 290: 97-104.
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Saint-Gregoire, P., E. Snoeck, V. Janovec and C. Roucau, 1993. New details on the Structure of the 3-q modulated phase of quartz type. Phys. Status Solidi A, 139: 361-370.
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Saint-Gregoire, P., I. Luk'yanchuk and N. Aliouane, 2001. The Elongated-Triangle (ELT) phase in quartz as an incommensurate ferroelastic. Izvestija Akademii Nauk, Serija Fizicheskaja, 65: 1119-1126.
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Saint-Gregoire, P., I. Luk'yanchuk, E. Snoeck, C. Roucau and V. Janovec, 1995. New incommensurate elongated-triangle phase in quartz. JETP Lett., Vol. 64. 10.1134/1.567212.
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Saint-Gregoire, P., M. Barthes, R. Almairac, J. Nouet, J.Y. Gesland, C. Filippini and U. Steigenberger, 1984. On the incommensurate phase in BaMnF₄: A neutron scattering study. Effect of the pressure. Ferroelectrics, 53: 307-310.
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Saint-Gregoire, P., M. Ribet and K. Tchakpele, 1989. Ferroelastic walls in lock-in phases of {N(CD₃)₄}₂ZnCl₄ and {N(CH₃)₄}₂CuCl₄. Ferroelectrics, 97: 277-292.

Saint-Gregoire, P., R. Almairac, A. Freund and J. Y.Gesland, 1986. Barium manganese fluoride BaMnF₄ as an improper ferroelastic. Ferroelectrics, 67: 15-21.

Saint-Gregoire, P., R. Almairac, E. Snoeck, J. Moret and V. Kopsky, 1999. Structural organization of fullerenes C₆₀, C₇₀, C₈₄. Ferroelectrics, 221: 37-46.
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Saint-Gregoire, P., R. Almairac, J. Lapasset and J. Moret, 1990. Structural phase transitions in KfeF₄ and related materials. Phys. Status Solidi A, 120: K25-K29.
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Saint-Gregoire, P., V. Janovec and B. Davies, 1996. Primary and secondary domain states in the simple cubic phase of C₆₀. Ferrolectrics, 185: 71-76.
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Saint-Gregoire, P., V. Janovec and V. Kopsky, 1997. A sample analysis of domain walls in simple cubic phase of C60. Ferroelectrics, 191: 73-78.
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Saint-Gregoire, P., V. Janovec, E. Snoeck, C. Roucau and Z. Zikmund, 1992. Domain wall vertices in Quartz: Symmetry, Classification and T.E.M. Observation. Ferroelectrics, 125: 209-214.
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Saint-Gregoire, P., W. Kleemann, F.J. Schafer and J. Moret, 1988. On the incommensurate phase in BaMnF4: sample dependence of the order parameter. J. Phys. France, 49: 463-469.
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Saint-Gregoire, P., Y. Gagou and T. Badeche, 2008. Anomalies of thermal dilatation and domain structure in the multiferroic material PbK₂LiNb₅O₁₅. Ferroelectrics, 376: 17-24.
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Sannikov, D.G., R. Almairac, A. Astito, J. Moret, J. Lapasset and P.Saint-Gregoire, 1994. Phenomenological theory of the transitions in the [P(CH₃)₄]₂ (CuCl₄)_x (CuBr₄)_1-x solid solution. J. Phys., 6: 849-849.
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Smirnov, M., N. Mazhenov, N. Aliouane and P. Saint-Gregoire, 2010. Novel features of the α- β phase transition in quartz-type FePO4 as evidenced by x-ray diffraction and lattice dynamics. J. Phys.: Condens. Matter, Vol. 22. 10.1088/0953-8984/22/22/225403.
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Smirnov, M., N. Mazhenov, N. Aliouane and P. Saint-Gregoire, 2010. Novel features of the α-β phase transition in quartz-type FePO4 as evidenced by x-ray diffraction and lattice dynamics. J. Phys. Condens. Matter, 22: 225403-225413.
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Snoeck, E., C. Roucau and P. Saint-Gregoire, 1986. Electron microscopy study of the modulated phases in berlinite AlPO₄ and quartz. J. Physique, 47: 2041-2053.
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Snoeck, E., P. Saint-Gregoire, V. Janovec and C. Roucau, 1994. T.E.M. study of 3-q modulated phase of quartz-type under electric field. Ferroelectrics, 155: 371-376.
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Zapart, B., E. Snoeck and P. Saint-Gregoire, 1997. Dense domain structure in ferroelastics by EPR. Ferroelectrics, 191: 179-185.
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