@article{VMUMM_1989_4_a11,
     author = {I. S. Emel'yanova},
     title = {Symmetric canonical equations with a {Hamiltonian} that depends explicitly on time},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {50--54},
     publisher = {mathdoc},
     number = {4},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1989_4_a11/}
}