R. Charoensub, and J. Siriphanich. 1988. “The Relationship Between Pulp-Soaking Symptom in Pummelos (Citrus grandis L. Osbeck) and Their Struture, Calcium Content, Pectin Methylesterase Activity and Internal Gas Composition”. Agriculture and Natural Resources 22 (5). Bangkok, Thailand:42-53. https://li01.tci-thaijo.org/index.php/anres/article/view/242565.