Radini, Ibrahim Ali, et al. “Heteroaromatization With 4-Phenyldiazenyl-1-Naphthol. Part II: Synthesis of Some New Benzochromens, Benzochromenopyrimidines, Benzochromenotriazolopyrimidines, Benzochromenopyrimidotriazepine and Antimicrobial Activities”. European Journal of Chemistry, vol. 8, no. 3, Sept. 2017, pp. 240-7, doi:10.5155/eurjchem.8.3.240-247.1599.