Esmukhan Ж.; Kuspekov К. Theorems on perpendicularity of a line and a plane. Рroblems of engineering and professional education, [S. l.], v. 7, n. 7, p. 26, 2023. DOI: 10.32523/2220-685X-2011-7-7-26. Disponível em: https://bulprengpe.enu.kz/index.php/main/article/view/292. Acesso em: 19 may. 2024.