@article{PORMA_1992__49_4_115801,
     author = {Haraux, A.},
     title = {Remarks on the wave equation with a nonlinear term with respect to the velocity},
     journal = {Portugaliae mathematica},
     pages = {447--454},
     publisher = {mathdoc},
     volume = {49},
     number = {4},
     year = {1992},
     mrnumber = {1300578},
     zbl = {0782.35042},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1992__49_4_115801/}
}