@article{IVM_1976_5_a14,
     author = {A. K. Lapkovskii and V. N. Laptinskii},
     title = {Horizontal paths and evolutes in the theory of gravitation},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {116--118},
     publisher = {mathdoc},
     number = {5},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1976_5_a14/}
}