Sirikul Thummajitsakul และ Kun Silprasit. (2021) Classification of some Boesenbergia and Alpinia extractsand their medicinal products based on chemical composition,antioxidant activity, and concentration of some heavy metals. <i>Songklanakarin Journal of Science and Technology (SJST)</i>, <i>43</i>(1), 160-168.Sirikul Thummajitsakul และ Kun Silprasit. "Classification of some Boesenbergia and Alpinia extractsand their medicinal products based on chemical composition,antioxidant activity, and concentration of some heavy metals". Songklanakarin Journal of Science and Technology (SJST) 43 (2021):160-168.Sirikul Thummajitsakul และ Kun Silprasit. Classification of some Boesenbergia and Alpinia extractsand their medicinal products based on chemical composition,antioxidant activity, and concentration of some heavy metals. Research and Development Office, Prince of Songkla University:ม.ป.ท. 2021.