UNNIKRISHNAN WARRIER, C., PRAVEEN BABU, M. (2012): A study on the spatial variations in stable isotopic composition of precipitation in a semiarid region of southern India. Hydrol. Process. Vol. 26, pp 3791-3799.
Harikumar P.S and Nasir U.P, Hydrochemical and isotopic investigation of a tropical wetland system in the Indian subcontinent, Environmental Earth Sciences, 2011 10.1007/s12665-011-1211-9 Impact Factor 1.765
Maheesan P.M, G Srinikethan and Harikumar, P.S, Performance evaluation of integrated treatment plant of trickling filter and constructed wetland, International Journal of Engineering Science and Technology (IJEST) Vol. 3 No. 1 Jan 2011
Nasir U. P and Harikumar P. S, Ecotoxicity and Ecosystem Health of Ramsar Wetland System of India, Journal of Environmental Protection, 2011, 2, 710-719 Impact Factor 0.85
UNNIKRISHNAN WARRIER, C., PRAVEEN BABU, M. (2011): A comparative study on isotopic composition of precipitation in wet tropic and semi-arid stations across southern India. J. Earth Syst. Sci., pp. 1085–1094
Harikumar P S and Jisha T S Distribution pattern of trace metal pollutants in the sediments of an urban wetland in the southwest coast of India, International Journal of Engineering Science and Technology, vol 2 (5),2010, 840-850.Impact Factor 0.8470
Harikumar P S, Prajitha K and Shilpa S , Assessment of Heavy Metal Contamination in the Sediment s of a River Draining into a Ramsar Site in the Indian Sub Continent, Journal of Advanced Laboratory Research in Biology, vol1(1) July 2010
Harikumar P S, Treatment of Wastewater Using Artificial Wetlands: Magazine on Everything about Water, October 2010 (municipal water sector)
Harikumar P.S and Nasir U.P, Ecotoxicological impact assessment of heavy metals in core sediments of a tropical estuary, Ecotoxicology and Environmental Safety 73 (2010) 1742–1747. Elsevier Publication Impact Factor 2.572
Harikumar P.S, Moly A and Sabna V Water and Sediment Quality Assessment of Malampuzha, a Multipurpose Reservoir in India, Journal of Environmental Science and Engineering vol 4(2), 2010
K.N.Remani, T.K.Jalaja and G R Asish. (2010). Antimicrobial Activity of Wetland Plant Excoecariaagallocha on Escherichia coli and Streptococcus haemolyticus. The Icfai University Journal of Life Sciences,Vol IV No.1 pp 42­47.
Madhavn K and Harikumar P S Assessment of Water Quality Characteristics of Soda Water, Pollution Research, 2010 Issue no 2
Unnikrishnan Warrier, C., Praveen Babu, M., Manjula, P., Velayudhan, K.T., Shahul Hameed, A. and Vasu, K., 2010. Isotopic Characterization of Dual Monsoon Precipitation-Evidence from Kerala, India. Current Science, Vol. 98, pp.1487-1495
Harikumar P S , Nasir U P and Mujeebu Rahman M P, Distribution of heavy metals in the core sediments of a tropical wetland system, International J. Environ. Sci. Tech., Vol 6(2), 2009, pp225-232 1.79
Jacks, G., P. S. Harikumar, and P. Bhattacharya. "Fluoride Mobilization in India." Goldschmidt Conf. Abstr. 2009.
K.N. Remani, P. Jayakumar and T.K. Jalaja(2009). Environmental Problems and Management Aspects of VembanadKol Wetlands in the South –West Coast of India. Journal of Nature Environment and Pollution Technology,Maharashtra.
SHAHUL HAMEED,A., UNNIKRISHNAN WARRIER, C., VELAYUDHAN, K.T. and SURAJ, S. (2009) : Hydraulic continuity between groundwater sources in the Malabar region of Kerala-Evidence from stable isotopes and Ion chemistry. In Recent trends in water research Hydroc
Sreenikethan, G., Maheesan, P.M and Harikumar, P.S (2009), Tertiary treatment in a vertical flow reed bed system, Journal of Industrial Pollution Control, 25 (1), pp. 79-81.
Shahul Hameed, A and Narasimha Prasad, N B, 2008, “Hydro-Chemical Assessment and Groundwater Recharge Mechanism in the Humid Tropics - A Case Study”, Jr. of Environmental Science and Engineering, October, Vol. 50, No. 4, pp. 263-270.
Harikumar P S, Madhavan K, Shimjida P and Bindu K R, Study on Hydrochemistry and Quality of Vembanad Lake in the Southwest (Kerala) Coast of India, Eco-Chronicle, Vol 2(2), June 2007, 69-80