D. S. Jaya and  G. P. Deepthi,  Assessment of Groundwater Quality in Karakulam Grama Panchayath in Thiruvananthapuram, Kerala State, South India.   journal   = {International Journal of Geological and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2015, vol. 106(10). 1209 - 1213
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/10002395.