Esakku, S., O.P. Karthikeyan, R. Nagendran and K. Joseph, 2008. Heavy metal fractionation and leachability studies on fresh and partially decomposed municipal solid wast. Pract. Periodicals Hazardous, Toxic Radio Waste Manage., 12: 127-132.
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Ganesh, G., O.P. Karthikeyan and K. Joseph, 2010. Enhancing the hydrolysis step in anaerobic digestion of municipal solid waste using rumen fluid. Int. J. Environ. Technol. Manage., 13: 311-321.
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Karthikeyan, O.P. and K. Joseph, 2008. Chemical precipitation of Ammonia-N as Struvite (MAP) from landfill leachate-effect of molar ratio upon recovery. Int. J. Solid Waste Technol. Manage., 34: 20-26.

Karthikeyan, O.P., M. Swati, K. Joseph and R. Nagendran, 2007. Performance of bioreactor landfill with waste mined from dumpsite. J. Environ. Monit. Assess., 135: 141-151.
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Karthikeyan, O.P., S. Murugesan, K. Joseph and L. Philip, 2011. Characterization of particulate matters and volatile organic compounds in the ambient environment of open dumpsites. Univ. J. Environ. Res. Technol., 1: 140-150.

Karthikeyan, O.P., S. Murugesan, K. Joseph and R. Nagendran, 2008. Leaching of Inorganic Pollutants from fresh and mined waste: A lysimeter study under tropical conditions. Int. J. Environ. Waste Manage., 2: 49-64.
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Nithikul, J., O.P. Karthikeyan and C. Visvanathan, 2011. Reject management from a mechanical biological treatment plant in Bangkok, Thailand. Resou. Conserv. Recycling, 55: 417-422.
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Salini, S., O.P. Karthikeyan and K. Joseph, 2010. Biological stability of municipal solid waste from simulated landfills under tropical environment. Bioresoruce Technol., 101: 845-852.
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Swati, M., O.P. Karthikeyan, K. Joseph and R. Nagendran, 2007. Landfill bioreactor-a biotechnological solution for waste management. J. Sci. Ind. Res., 66: 589-674.

Visvanathan, C., N.H. Yin and O.P. Karthikeyan, 2010. Co-disposal of electronic waste with municipal solid waste in bioreactor landfills. Waste Manage., 30: 2608-2614.
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Visvanathan, C., O.P. Karthikeyan and K.H. Park, 2011. Sustainable landfilling in tropical conditions: Comparison between open and closed cell approach. Waste Manage. Res., 29: 386-396.
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Xu, S.Y., H.P. Lam, O.P. Karthikeyan and J.WC. Wong, 2011. Optimization of food waste hydrolysis in leach bed coupled with methanogenic reactor: Effect of pH and bulking agent. Bioresour. Technol., 102: 3702-3708.
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