@article{CMUC_2005__46_3_a12,
     author = {Tymchatyn, E. D. and Zarichnyi, M.},
     title = {A note on operators extending partial ultrametrics},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {515--524},
     publisher = {mathdoc},
     volume = {46},
     number = {3},
     year = {2005},
     mrnumber = {2174529},
     zbl = {1121.54045},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2005__46_3_a12/}
}