Drambyan, Aram K., and Hamlet V. Mikaelyan. “ON SEMISTRONG EDGE-COLORINGS OF OUTERPLANAR GRAPHS”. Proceedings of the YSU A: Physical and Mathematical Sciences 59, no. 2 (267) (June 25, 2025): 32–45. Accessed January 21, 2026. https://journals.ysu.am/index.php/proceedings-phys-math/article/view/vol59_no2_2025_pp032-045.