Anti-Platelet Aggregation and Chemical Constituents from the Rhizome of Gynura japonica - Lin, Wei-Yu; Kuo, Yueh-Hsiung; Chang, Ya-Ling; Teng, Che-Ming; Wang, Eng-Chi; Ishikawa, Tsutomu; Chen, Ih-Sheng (Planta Medica, 2003)