Voir la notice de l'article provenant de la source Math-Net.Ru
@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/} }
L. N. Krivonosov. A~certain extension of metric spaces. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 4 (1975), pp. 33-36. http://geodesic.mathdoc.fr/item/IVM_1975_4_a3/