Zinchenko, H. M., L. V. Muzychka, Y. V. Verves, and O. B. Smolii. “A Convenient Approach to the Synthesis of New 4-Amino Substituted Derivatives pyrido[2,3-d]pyrimidin-7-One”. Journal of Organic and Pharmaceutical Chemistry, vol. 14, no. 4(56), Dec. 2016, pp. 40-47, doi:10.24959/ophcj.16.906.