Khavidі Kh. M. “Mutual Arrangement of Subspaces in a Finitely Meric Unitary Space ”. Ukrains’kyi Matematychnyi Zhurnal 18, no. 6 (October 27, 1966): 130–134. Accessed February 17, 2026. https://umj.imath.kiev.ua/index.php/umj/article/view/8470.