@article{03693753, title = {A non-linear hyperbolic equation.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {3}, year = {1980}, pages = {505-520}, doi = {10.1155/S0161171280000385}, zbl = {0444.34060}, language = {en}, url = {http://dml.mathdoc.fr/item/03693753} }
Henriques de Brito, Eliana. A non-linear hyperbolic equation.. International Journal of Mathematics and Mathematical Sciences, Tome 3 (1980) pp. 505-520. doi : 10.1155/S0161171280000385. http://gdmltest.u-ga.fr/item/03693753/