Zheleva, I., Kambourova, V., Rusev, R., & Dimitrov, P. (2000). Mathematical modeling of the melt heating processes in a furnace, producing flat glass. Ann. Sofia Univ. Fac. Math. And Inf., 92, 123–133. Retrieved from https://ftl5.uni-sofia.bg./index.php/fmi/article/view/259