Mirzayev, F. S. o‘g‘li, and G. G. Shokirova. “BIRINCHI TARTIBLI KVAZICHIZIQLI TENGLAMALAR UCHUN CHEGARAVIY MASALA”. Educational Research in Universal Sciences, vol. 2, no. 5, May 2023, pp. 176-9, http://erus.uz/index.php/er/article/view/2611.