“?SYNTHESIS OF HETERO-BICYCLIC COMPOUNDS PART-X. FORMATION OF 2H,4H,5H 2,2-DIPHENYL-4, 5-DIOXOPYRIDO [4, 3-d] 1,3 DIOXIN”, Pakistan Journal of Scientific & Industrial Research, vol. 46, no. 6, pp. 406–408, Dec. 2003, Accessed: Mar. 10, 2026. [Online]. Available: https://www.v2.pjsir.org/index.php/biological-sciences/article/view/1687