Literature 9: Liu Yu-jia,Zhao Tian-rui,Zhao Feng-yun. Melissopalynology and trophic niche of Apis cerana ceraca and Apis mellifera ligustica in Yunnan Province of Southwest China. Chinese Journal of Applied Ecology, 2013,24(1):205-210. Literature in Chinese, download from: HTML阅读-云南中华蜜蜂与意大利蜜蜂的蜂蜜孢粉学和营养生态位