Tan, Keng Hong, and Lin Tze Tan. “Movements of Floral Parts and Roles of the Tooth on the Column Wall of Bulbophyllum Praetervisum (Orchidaceae) Flower in Pollination by Dacini Fruit Flies (Diptera: Tephritidae)”. Journal of Pollination Ecology, vol. 24, Dec. 2018, pp. 157-63, doi:10.26786/1920-7603(2018)19.