Panabokke, Chris R.; Ariyaratne, B. Ranjith; Seneviratne, Anoja; Wijekoon, Deepthi; Molle, François(International Water Management Institute, Colombo, Sri Lanka, 2007)
Somaratne, P. G.; Jinapala, K.; Perera, L. R.; Ariyaratne, B. Ranjith; Bandaragoda, D. J.; Makin, Ian(International Water Management Institute, Colombo, Sri Lanka, 2003)