A New LC/MS/MS Method for the Analysis of Phyllanthin in Rat Plasma and its Application on Comparative Bioavailability of Phyllanthin in Different Formulations after Oral Administration in Rats, Van Long, Nguyen, Van Men Chu, Tuan Anh Vu, Van Manh Nguyen, Duc Thanh Chu, Thu Ha Bui Thi, Van Luong Hoang, Quang Le Bach, and Khanh Pham Gia , Pharmacognosy Journal, September 2019, Volume 11, Issue 5, p.968-975, (2019)