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    • Unnikrishnan Warrier, C., Praveen Babu, M., Sudheesh, M. and Deshpande, R.D., 2015., Studies on Stable Isotopic Composition of Daily Rainfall from Kozhikode, Kerala, India’, DOI: 10.1080/10256016.2016.1103238
    • R. Santhosh Kumar, Girish Gopinath, T.R. Resmi (2014) Groundwater Chemistry of an Urban Coastal Aquifer- Kerala, India. Journal of Coastal Sciences, Vol.1 (2), pp.20-25.
    • Unnikrishnan Warrier, C. and Manjula, P., 2014. River-Groundwater Interaction of a Tropical Sub Basin of Bharatapuzha, Kerala, India. International Journal of Advanced Technology in Engineering and Science, Vol.2 (7), pp.382-393
    • Unnikrishnan Warrier, C. and Manjula, P., 2014. Morphometric Analysis of Thuthapuzha Sub Basin, Kerala, India, International Research Journal of Sustainable Science and Engineering, Vol.2 (7), pp.1-10
    • Girish Gopinath, Resmi T R and P Seralathan (2013). Assessment of groundwater quality in Kavaratti island in the Lakshadweep Archipelagos, India, Chemistry and Ecology, Vol. 29 (4), pp. 309-319; DOI:10.1080/02757540.2012.760546
    • Unnikrishnan Warrier, C., Praveen Babu, M. and Manjula, P. and Shahul Hameed, A., 2013. Spatial and Temporal Variations of Natural Tritium in Precipitation of Southern India. Current Science, Vol. 105, pp. 242- 248
    • 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.
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    • 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
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    • CHIDAMBARAM, S., PRASANNA, M.V., RAMANATHAN, A. L., VASU, K., SHAHUL HAMEED, A., UNNIKRISHNAN WARRIER,C., SRINIVASAMOORTHY, MANIVANNAN, R., TIRUMALESH, K., ANANTHAN, P. AND JOHNSONBABU, G. (2009): A study on the factors affecting the stable isotopic composition in precipitation of Tamil Nadu, India, Hydrological Processes, Vol.23, 1729-1800.
    • 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 Hydrochemical and hydrological Perspective. (eds. Chidambaram,S. Ramanathan, A.L., Shivanna, K and Arthur James) I.K. International Publishing House Pvt. Ltd. New Delhi. pp.31-40
    • Unnikrishnan Warrier, C., Shahul Hameed, A., Velayudhan, K.T., Manjula, P. and Vasu, K., 2009. Estimation of Sedimentation Rate in Chilika Lake, Orissa using Environmental 210pb Isotope Systematics. Journal of Applied Geochemistry, Vol. 11, pp. 102-110