Davoodnia, A. (2010) “H2SO4/Silica gel: An Efficient and Reusable Heterogeneous Catalyst for the Synthesis of Pyrazolo[4,3-e][1,2,4]triazolo[4,3-c]pyrimidines”, Asian Journal of Chemistry, 22(2), pp. 1595–1598. Available at: https://asianpubs.org/index.php/ajchem/article/view/11300 (Accessed: 1 July 2024).