Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_2017_101_1_a1, author = {A. T. Asanova}, title = {Periodic {Solutions} in the {Plane} of {Systems} of {Second-Order} {Hyperbolic} {Equations}}, journal = {Matemati\v{c}eskie zametki}, pages = {20--30}, publisher = {mathdoc}, volume = {101}, number = {1}, year = {2017}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_2017_101_1_a1/} }
A. T. Asanova. Periodic Solutions in the Plane of Systems of Second-Order Hyperbolic Equations. Matematičeskie zametki, Tome 101 (2017) no. 1, pp. 20-30. http://geodesic.mathdoc.fr/item/MZM_2017_101_1_a1/