@article{VMUMM_1982_3_a18,
     author = {D. A. Onishchenko},
     title = {Reduction to normal form of equations of a canonical system depending on a parameter},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {78--81},
     publisher = {mathdoc},
     number = {3},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1982_3_a18/}
}