Ismonov Xurshidbek, Rustamov Umurzoq, and Abduraimova Muazzamoy. “MARKAZIY VA PARALLEL PROYEKSIYA ORTOGONAL PROYEKSIYALAR VA MODELNI KO‘RINISHLARI”. Educational Research in Universal Sciences, vol. 1, no. 4, Sept. 2022, pp. 70-81, http://erus.uz/index.php/er/article/view/11.