@article{10_21136_CMJ_1989_102288,
     author = {Rovnyak, James},
     title = {Operator-valued analytic functions of constant norm},
     journal = {Czechoslovak Mathematical Journal},
     pages = {165--168},
     publisher = {mathdoc},
     volume = {39},
     number = {1},
     year = {1989},
     doi = {10.21136/CMJ.1989.102288},
     mrnumber = {983493},
     zbl = {0686.47013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1989.102288/}
}