@article{IVM_2006_1_a10,
     author = {B. M. Dubrov},
     title = {On a class of contact invariants of systems of ordinary differential equations},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {76--77},
     publisher = {mathdoc},
     number = {1},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2006_1_a10/}
}