Ong-ard Lawhavinit, Kiti Srisuparb, Nongnuch Jantaraj, and Supranee Chinabut, “Studies on Hexamita Disease in Intestine of Discus, Symphysodon aequifasciata”, Agr. Nat. Resour., vol. 28, no. 1, pp. 66–73, Mar. 1994.