@article{SM_1969_7_2_a1,
     author = {E. A. Larionov},
     title = {On~the number of fixed points of a~linear-fractional transformation of an~operator ball onto itself},
     journal = {Sbornik. Mathematics},
     pages = {195--204},
     publisher = {mathdoc},
     volume = {7},
     number = {2},
     year = {1969},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1969_7_2_a1/}
}