Nakagawa, H.Ikebuchi,, S.Kohsaki, S.Makhanu, K.S.Wakabayashi, K.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.220-224http://tri.nsf.ac.lk/themes/Mirage/1/SEM/SEM-1994/SPRO-1994-5/SPRO-1994-5_3_220.PDFhttps://dl-iesl.nsf.gov.lk/handle/1/3416Conference Paper