@article{105243, author = {Old\v rich Hor\'a\v cek}, title = {\"Uber die Existenz einer periodischen L\"osung der nichtlinearen Wellengleichung in $E\_2$ (Vorl\"aufige Mitteilung)}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {010}, year = {1969}, pages = {421-424}, zbl = {0189.15202}, mrnumber = {0259324}, language = {de}, url = {http://dml.mathdoc.fr/item/105243} }
Horáček, Oldřich. Über die Existenz einer periodischen Lösung der nichtlinearen Wellengleichung in $E_2$ (Vorläufige Mitteilung). Commentationes Mathematicae Universitatis Carolinae, Tome 010 (1969) pp. 421-424. http://gdmltest.u-ga.fr/item/105243/
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