AZOUZ, M., et al. “Generation and Trapping of 2-Methyl-3-Phenyl-4-Oxoquinazolinium-1-Methanide: Routes to Pyrrolo[1,2-a]quinazolinones”. Asian Journal of Chemistry, vol. 20, no. 2, Mar. 2010, pp. 954-62, https://asianpubs.org/index.php/ajchem/article/view/12523.