@article{MZM_2009_85_1_a3,
     author = {V. A. Kondrat'ev and I. A. Rudakov},
     title = {Periodic {Solutions} of a {Quasilinear} {Wave} {Equation}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {36--53},
     publisher = {mathdoc},
     volume = {85},
     number = {1},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2009_85_1_a3/}
}