S. T. Jorgensen, A. Pookpakdi, S. Tudsri, O. Stolen, R. Ortiz and J. L. Christiansen
Acta Agriculture Scandinavica Section B-Soil & Plant Science 60 ( 3 ): 199 - 210 , 2010
J. L. Christiansen, S. -E. Jacobsen and S. T. Joslashrgensen
Acta Agriculture Scandinavica Section B-Soil & Plant Science 60 ( 6 ): 539 - 544 , 2010