@article{IVM_1975_4_a3,
     author = {L. N. Krivonosov},
     title = {A~certain extension of metric spaces},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {33--36},
     publisher = {mathdoc},
     number = {4},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1975_4_a3/}
}