Theppakorn, Theerapong, AND 		Wongsakul, Sirirung.
" Optimization and Validation of the HPLC-Based Method for the Analysis of Gallic acid, Caffeine and 5 Catechins in Green Tea" <em>Naresuan University Journal: Science and Technology (NUJST)</em> [Online], Volume 20 Number 2 (19 July 2013)