@article{CMUC_1988__29_3_a0,
     author = {Kuczumow, Tadeusz and Stachura, Adam},
     title = {Extensions of nonexpansive mappings in the {Hilbert} ball with the hyperbolic metric. {I.}},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {399--402},
     publisher = {mathdoc},
     volume = {29},
     number = {3},
     year = {1988},
     mrnumber = {972824},
     zbl = {0672.47035},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1988__29_3_a0/}
}