Sukuntaros Tadakittisarn, Molnapat Songpim, and Pilanee Vaithanomsat, “Polygalacturonase and Pectate Lyase Activity During Ripening of Kluay Hom Thong Fruit”, Agr. Nat. Resour., vol. 43, no. 5, pp. 267–274, Dec. 2009.