Davoodnia, A., L. Anvari, and N. Tavakoli-Hoseini. 2011. “Microwave Synthesis of New Pyrazolo[3,4-d]pyrimidin-4-Ones in Solvent-Free Condition”. Asian Journal of Chemistry 23 (8):3683-85. https://asianpubs.org/index.php/ajchem/article/view/10668.