H. A. Elmusharaf, I. E. Barakat, and A. E. M. Saeed, “Synthesis of Some Bigienelli Compounds from Thiosemicarbazide use ZnCl2 as Catalyst under Solvent Free Condition”, IJSBAR, vol. 23, no. 1, pp. 383–391, Jun. 2015, Accessed: Sep. 11, 2025. [Online]. Available: https://www.gssrr.org/JournalOfBasicAndApplied/article/view/4231