Proceedings 3rd International Conference on Plant Protection in the Tropics: volume IV, Malaysian Plant Protection Society (Malaysia): Pahang (Malaysia), 20-23 Mar 1990, p. 148-150
Proceedings of the 3rd International Conference on Plant Protection in the Tropics: volume VI, Malaysian Plant Protection Society (Malaysia): Pahang (Malaysia), 20-23 Mar 1990, p. 96-101