@article{VMUMM_2013_5_a8,
     author = {O. A. Zagryadskii and D. A. Fedoseev},
     title = {The explicit form of the {Bertrand} metric},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {46--50},
     publisher = {mathdoc},
     number = {5},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2013_5_a8/}
}