W A W K Wijayalath, J Rajakaruna, K Gamage, K Perera, K L R L Perera, C Ameratunga, N Sakihama, K Tanabe, S Cheesman, R Carter, S M Handunnetti and P P S L Pathirana. Are relapse infections of Plasmodium cynomolgi, clones of primary infections? Proceedings of the Joint Academic Sessions, Faculties of Science and Medicine of the University of Colombo. 2004, Page 23.