F. Bamoharram, Fatemeh, et al. “One-Pot Multi Component Synthesis of 4-Arylaminoquinazolines in the Presence of Sodium 30-Tungstopentaphosphate”. Asian Journal of Chemistry, vol. 23, no. 2, Oct. 2010, pp. 511-4, https://asianpubs.org/index.php/ajchem/article/view/15811.