Stojkovikj, N., Kocaleva, M., Martinovska Bande, C., Stojanova, A., & Zlatanovska, B. (2020). Application of the Four-Color Theorem for coloring a city map. Balkan Journal Of Applied Mathematics And Informatics, 3(1), pp. 25-36. Retrieved from http://js.ugd.edu.mk/index.php/bjami/article/view/3427