@article{DAN_1997_352_3_a8,
     author = {I. G. Fikhtengol'ts},
     title = {Characteristic vectors and characteristic tensors for spaces with},
     journal = {Doklady Akademii Nauk},
     pages = {318--322},
     publisher = {mathdoc},
     volume = {352},
     number = {3},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1997_352_3_a8/}
}