TY - J Syst Evol A1 - Xu Ke-Xue T1 - A preliminary introduction to mathematical methods for taxonomy Y1 - 1982-11-18 JF - Journal of Systematics and Evolution JO - J Syst Evol SP - 502 EP - 509 VL - 20 IS - 4 UR - https://www.jse.ac.cn N1 - ER -