@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/} }