Niem, Nguyen, 		Trung, Le, 		Thai, Pham, 		Dat, Trinh, 		Nguyet, Nguyen, AND 		Hoai, Tran.
" Preliminary Study on Morphological anh Genetic Characteristics of some Native Honeybee (apis cerana) Populations in Northern Vietnam" <em>VNU Journal of Science: Natural Sciences and Technology</em> [Online], Volume 17 Number 1 (15 March 2001)