A reproducible analytical system based on the multi-component analysis of triterpene acids in Ganoderma lucidum - Da, J; Cheng, C R; Yao, S; Long, H L; Wang, Y H; Khan, I A; Li, Y F; Wang, Q R; Cai, L Y; Jiang, B H; Liu, X; Wu, W Y; Guo, D A (Phytochemistry, 2015)