@article{DE_2005_41_10_a11,
     author = {I. A. Rudakov},
     title = {A {Nontrivial} {Periodic} {Solution} of the {Nonlinear} {Wave} {Equation} with {Homogeneous} {Boundary} {Conditions}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1392--1399},
     publisher = {mathdoc},
     volume = {41},
     number = {10},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2005_41_10_a11/}
}