SamoilenkoY. S. and StriletsO. V. (2009) “On simple $n$-tuples of subspaces of a Hilbert space”, Ukrains’kyi Matematychnyi Zhurnal, 61(12), pp. 1668-1703. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3130 (Accessed: 24November2024).