C. Thivya, S. Chidambaram, R. Thilagavathi, M. Nepolian, and A. V.S, “Evaluation of drinking water quality index (DWQI) and its seasonal variations in hard rock aquifers of Madurai district, Tamilnadu”, IJAG, vol. 2, no. 2, pp. 48–52, May 2014, doi: 10.14419/ijag.v2i2.2294.