Three Novel Sterols Isolated from Selaginella tamariscina with Antiproliferative Activity in Leukemia Cells - Gao, Liang-liang; Yin, Shi-liang; Li, Zhan-lin; Sha, Yi; Pei, Yue-hu; Shi, Guang; Jing, Yong-kui; Hua, Hui-ming (Planta Medica, 2007)