Radini, I. A., & Abd El-Wahab, A. H. F. (2016). Heteroaromatization with 4-phenyldiazenyl-1-naphthol. Part I: Synthesis of some new naphthopyrans and naphthopyranopyrimidines. European Journal of Chemistry, 7(2), 230–237. https://doi.org/10.5155/eurjchem.7.2.230-237.1432