@article{10_4153_CJM_2013_025_4,
     author = {Plevnik, Lucijan and \v{S}emrl, Peter},
     title = {Maps {Preserving} {Complementarity} of {Closed} {Subspaces} of a {Hilbert} {Space}},
     journal = {Canadian journal of mathematics},
     pages = {1143--1166},
     year = {2014},
     volume = {66},
     number = {5},
     doi = {10.4153/CJM-2013-025-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-2013-025-4/}
}