Kamalamma, N.Raja, E.K.N.V.Prema, N.Pushpa, K.S.2021-07-012021-07-011994Affordable Water Supply and Sanitation:Proceedings of the 20th WEDC Conference, Taj Samudra Hotel, Colombo, Sri Lanka, 22-26 August 1994:p.113-114https://dl-iesl.nsf.gov.lk/handle/1/3384Conference Paper