Identification of effective pollinators of Primula merrilliana and effects of flower density and population size on pollination efficiency
Jian-Wen SHAO, Xiao-Ping ZHANG, Zhong-Xin ZHANG, Guo-Ping ZHU
J Syst Evol . 2008, (4): 537 -544 .  DOI: 10.3724/SP.J.1002.2008.07142