@article{105931, author = {Nina Klimperov\'a}, title = {Periodic solutions to the inhomogeneous sine-Gordon equation}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {020}, year = {1979}, pages = {329-333}, zbl = {0413.35009}, mrnumber = {539561}, language = {en}, url = {http://dml.mathdoc.fr/item/105931} }
Klimperová, Nina. Periodic solutions to the inhomogeneous sine-Gordon equation. Commentationes Mathematicae Universitatis Carolinae, Tome 020 (1979) pp. 329-333. http://gdmltest.u-ga.fr/item/105931/
Periodic solutions of a linear and weakly nonlinear wave equation in one dimension, I., Czechoslovak Math. J. 14 (89) (1964), 341-382. (1964) | MR 0174872