@article{IVM_1976_11_a9,
     author = {V. B. Tret'yakov},
     title = {Transformation groups that preserve the set of generalized trajectories},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {80--86},
     publisher = {mathdoc},
     number = {11},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1976_11_a9/}
}