Griffiths, David; Dyer, Christopher(The National Oceanographic and Atmospheric Administration, and Aguirre International, Maryland, United States, 1996)
Somaratne, P. G.; Jinapala, K.; Perera, L. R.; Ariyaratne, B. Ranjith; Bandaragoda, D. J.; Makin, Ian(International Water Management Institute, Colombo, Sri Lanka, 2003)