Novel biotransformation processes of dihydroartemisinic acid and artemisinic acid to their hydroxylated derivatives by two plant cell culture systems - Zhu, Jian-Hua; Yu, Rong-Min; Yang, Li; Hu, Yan-Shan; Song, Li-Yan; Huang, Yan-Jun; Li, Wei-Min; Guan, Shi-Xia (Process Biochemistry, 2010)