@article{10_4064_ap_50_2_153_155,
     author = {Marek Ptak},
     title = {Unitary dilation and fixed point theorem},
     journal = {Annales Polonici Mathematici},
     pages = {153--155},
     publisher = {mathdoc},
     volume = {50},
     number = {2},
     year = {1989},
     doi = {10.4064/ap-50-2-153-155},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-50-2-153-155/}
}