RAMESH BABU, V.N.S., V. PRABHAKAR REDDY, and P. HANUMANTHA RAO. 2010. “Synthesis of 1,2,3,5-Tetrahydropyrimido- [1,2-c]benzimidazoles”. Asian Journal of Chemistry 19 (5):3483-86. https://asianpubs.org/index.php/ajchem/article/view/13233.