@article{VMUMM_1986_2_a10,
     author = {V. I. Borzov},
     title = {Reduction in the order of systems of differential equations in problems of mechanics},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {56--59},
     year = {1986},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1986_2_a10/}
}