А.П. Фарайзаде, and Shafie А. “On Kuratowski’s Problem in Vector Spaces”. Bulletin of L.N. Gumilyov Eurasian National University. Mathematics, computer science, mechanics series 125, no. 4 (December 30, 2018): 117–119. Accessed November 21, 2024. https://bulmathmc.enu.kz/index.php/main/article/view/35.