Abdel-Aziem, A., El-Gendy, M. S., & Abdelhamid, A. O. (2012). Synthesis and antimicrobial activities of pyrido[2,3-d]pyrimidine, pyridotriazolopyrimidine, triazolopyrimidine, and pyrido[2,3-d:6,5d’]dipyrimidine derivatives. European Journal of Chemistry, 3(4), 455–460. https://doi.org/10.5155/eurjchem.3.4.455-460.683