@article{MZM_1997_62_2_a6,
     author = {R. S. Ismagilov},
     title = {Ultrametric spaces and related {Hilbert} spaces},
     journal = {Matemati\v{c}eskie zametki},
     pages = {223--237},
     year = {1997},
     volume = {62},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1997_62_2_a6/}
}