@article{DAN_1989_305_6_a6,
     author = {I. G. Nikolaev},
     title = {Isotropic metric spaces},
     journal = {Doklady Akademii Nauk},
     pages = {1314--1317},
     publisher = {mathdoc},
     volume = {305},
     number = {6},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_305_6_a6/}
}