@article{VMUMM_1984_2_a1,
     author = {I. A. Rudakov},
     title = {Nonlinear oscillations of a string},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {9--13},
     publisher = {mathdoc},
     number = {2},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1984_2_a1/}
}