Temirbolat SE, Khushnizarov GM. About ellipticity P2 - approximation for the stationary equation of a one - speed transfer. JMMCS [Internet]. 2013 Mar. 23 [cited 2025 Jan. 3];76(1):53-9. Available from: https://bm.kaznu.kz/index.php/kaznu/article/view/87