@article{TMF_1977_30_1_a1,
     author = {Yu. M. Shirokov},
     title = {On admissible forms of canonical mechanics},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {6--11},
     year = {1977},
     volume = {30},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1977_30_1_a1/}
}