TEMIRBOLAT, S. E.; KHUSHNIZAROV, G. M. About ellipticity P2 - approximation for the stationary equation of a one - speed transfer. Journal of Mathematics, Mechanics and Computer Science, [S. l.], v. 76, n. 1, p. 53–59, 2013. Disponível em: https://bm.kaznu.kz/index.php/kaznu/article/view/87. Acesso em: 3 jan. 2025.