KUNNO, Rikan, Chalerm RUANGVIRIYACHAI, and Saksit CHANTHAI. 2011. “Sample Preparation for Trace Analysis of Iron, Copper and Zinc in Thai Fruit Wines by ICP-AES”. Walailak Journal of Science and Technology (WJST) 6 (2):243-54. https://wjst.wu.ac.th/index.php/wjst/article/view/64.