USMONOV, M. T. o‘g’li. Matritsa rangi. Matritsa rangini hisoblash usullari. Science and Education, [S. l.], v. 2, n. 8, p. 280-291, 2021. Disponível em: https://openscience.uz/index.php/sciedu/article/view/1758. Acesso em: 20 oct. 2021.