Amal F. Soliman, Zein M. Naeem, Ashraf T. Khalil, Kuniyoshi Shimizu, and Saleh H. El-Sharkawy. 2018. “Microbial Transformation of the Labdane Diterpene 13-Epi-Cupressic Acid”. World Journal of Pharmaceutical Sciences 6 (5):61-69. https://www.wjpsonline.com/index.php/wjps/article/view/microbial-transformation-diterpene-epi-cupressic-acid.