@article{TM_2010_270_a16,
     author = {I. A. Rudakov},
     title = {On time-periodic solutions of a~quasilinear wave equation},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {226--232},
     year = {2010},
     volume = {270},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_2010_270_a16/}
}