@article{10_4064_sm223_2_4,
     author = {Eva Kopeck\'a and Vladim{\'\i}r M\"uller},
     title = {A product of three projections},
     journal = {Studia Mathematica},
     pages = {175--186},
     year = {2014},
     volume = {223},
     number = {2},
     doi = {10.4064/sm223-2-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm223-2-4/}
}