S. Cha-um, S. Surawattananon, K. Namwongprom, and C. Wongwattana, “In Vitro Culture of Indica Rice ( Oryza sativa L. cv. Nang Mol S 4 )”, Agr. Nat. Resour., vol. 31, no. 2, pp. 166–174, Jun. 1997.