@article{DAN_1972_202_4_a9,
     author = {V. Z. Feinberg},
     title = {Finite ultrametric spaces},
     journal = {Doklady Akademii Nauk},
     pages = {775--778},
     year = {1972},
     volume = {202},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_202_4_a9/}
}