Salam, Abdul, and Ausaf Akhtar. “?SYNTHESIS OF HETERO-BICYCLIC COMPOUNDS PART-X. FORMATION OF 2H,4H,5H 2,2-DIPHENYL-4, 5-DIOXOPYRIDO [4, 3-D] 1,3 DIOXIN”. Biological Sciences - PJSIR 46, no. 6 (December 22, 2003): 406–408. Accessed May 18, 2024. https://v2.pjsir.org/index.php/biological-sciences/article/view/1687.