Ontogenetic Development of Sexual Dimorphism in Body Mass of Wild Black-and-White Snub-Nosed Monkey (<i>Rhinopithecus bieti</i>) oleh Yan-Peng Li, Zhi-Pang Huang, Yin Yang, Xiao-Bin He, Ru-Liang Pan, Xin-Ming He, Gui-Wei Yang, Hua Wu, Liang-Wei Cui, Wen Xiao