@article{MAT_1967_11_6_a1,
     author = {W. Mlak},
     title = {Unitary dilations of contraction operators},
     journal = {Matematika},
     pages = {21--95},
     year = {1967},
     volume = {11},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAT_1967_11_6_a1/}
}