Optimization of Solvent Extraction of the Leaves of Premna serratifolia and Quantitation of Premnaodoroside A by Validated TLC-densitometric Method, Yee, Khin Su, Sukwattanasinit Tasamaporn, Sotanaphun Uthai, Wetwitayaklung Penpun, Wangwattana Bunyapa, and Narakornwit Worrakanya , Pharmacognosy Journal, December 2021, Volume 13, Issue 6s, p.1656-1663, (2021)