@article{VMUMM_1987_1_a17,
     author = {E. V. Ferapontov},
     title = {Reductions of some systems of differential equations definable by their symmetries},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {63--65},
     year = {1987},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1987_1_a17/}
}