@article{articlebdf829c0,
title   = {Systems of subspaces of a unitary space},
author = {Bondarenko, Vitalij M and Futorny, Vyacheslav and Klimchuk, Tatiana and Sergeichuk, Vladimir V and Iusenko, Kostiantyn},
year = {2013},
doi = {10.1016/j.laa.2012.10.038},
journal   = {Linear Algebra and Its Applications}
}