M. W. Khan, M. E. Haque, and M. F. Ahmed, “An expeditious synthesis of 6-Amido-(1H,3H)-Pyrimidine- 2,4-Diones from Uracil-6-Carboxylic Acid”, Dhaka Univ. J. Pharm. Sci, vol. 13, no. 1, pp. 23–29, Feb. 2015.