Narong Chungsamarnyart, Teerapol Sirinarumitr, Wilairat Chumsing, and Worawidh Wajjawalku, “In vitro Study of Antiviral Activity of Plant Crude-extracts against the Foot and Mouth Disease Virus”, Agr. Nat. Resour., vol. 41, no. 5, pp. 97–103, Dec. 2007.