@article{IVM_1986_1_a2,
     author = {L. E. Evtushik and V. B. Tret'yakov},
     title = {Invariant description of ordinary systems in terms of nonlinear connections},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {21--32},
     publisher = {mathdoc},
     number = {1},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1986_1_a2/}
}