SamoilenkoYu. S., and StriletsO. V. “On Simple $n$-Tuples of Subspaces of a Hilbert Space”. Ukrains’kyi Matematychnyi Zhurnal 61, no. 12 (December 25, 2009): 1668-1703. Accessed July 27, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3130.