Peer reviewed

1. Sabu Thomas, Hari Krishnan K, Manoj Narayanan and Sandhya C. Nair. 2004. Detection and Molecular characterization of waterborne pathogenic E. coli from different water sources using Multiplex PCR. In: Indian Journal of Biotechnology, 3: 603-605.
2. Hari Krishnan, K., Sanil George, Sabu Thomas, Paul Murugan, R. and Das, M. R. 2001. Distribution of HCH residues in the Kuttanad wetland ecosystem, Kerala. Ecology, Environment and Conservation. 7 (1) : 105 – 109.
3. Sabu Thomas, Hari Krishnan, K., Sanil George, Paul Murugan, R. and Das, M. R. 2001. Studies on the water quality of Kuttanad wetland ecosystem of Kerala. Pollution Research. 20 (1) : 59 –66.
4. Hari Krishnan, K. and Abdul Azis, P. K. 2000. A study on the effect of some pesticides on the primary production in aquatic environments. Asian Journal of Microbiology, Biotechnology and Environmental Sciences. 2 (3&4) :191 – 194.
5. Hari Krishnan, K. and Abdul Azis, P.K. 1999. Impact of coir retting on the water quality and primary production of backwaters of Kerala. Science and Culture. 65 (7-8): 265.
6. Hari Krishnan, K., Sabu Thomas, Sanil George, Paul Murugan, R. Sathish Mundayoor and Das, M.R.. 1999. A study on the distribution and ecology of phytoplankton in the Kuttanad wetland ecosystem, Kerala. Pollution Research . 18 (3): 261 -269.
7. Sanil George, Hari Krishnan, K., Sabu Thomas, Paul Murugan, R. Sathish Mundayoor and Das, M.R.. 1999. Distribution of heavy metals in the Kuttanad wetland ecosystem, Kerala. . International Journal of Ecology and Environment. 25 (1): 91 – 95.
8. Sabu Thomas, Sanil George, Hari Krishnan, K., Paul Murugan, R., Sathish Mundayoor and Das, M.R. 1999. Spatio – temporal distribution and ecology of benthos in the Kuttanad wetland ecosystem, Kerala. Pollution Research. 18 (3): 235 – 243.
9. Hari Krishnan, K. and Abdul Azis, P. K. 1999. Zooplankton of the coconut husk retting zone in the Edava-Nadayara estuary, Kerala. Journal Of Environment and Pollution. 6 (1): 13 – 18.
10. Hari Krishnan, K. 1997. Phytoplankton as indicator of organic pollution in aquatic biotopes. Journal of Zoological Society of Kerala. 6 & 7 : 83 –86.