Ugrasena, I., S. Sutaryo, E. Supriadi, L. Vroling, J. Cloos, J. Hooijberg, and A. Veerman. “High Frequency of the 3R/3R Polymorphism in the Thymidylate Synthase Enhancer Region in Indonesian Childhood Acute Lymphoblastic Leukemia”. Paediatrica Indonesiana, Vol. 46, no. 3, Oct. 2016, pp. 103-12, doi:10.14238/pi46.3.2006.103-12.