@article{PORMA_2001__58_4_52870,
     author = {Eloulaimi, R. and Guedda, M.},
     title = {Nonexistence of global solutions of nonlinear wave equations.},
     journal = {Portugaliae mathematica},
     pages = {449--460},
     publisher = {mathdoc},
     volume = {58},
     number = {4},
     year = {2001},
     zbl = {1101.35337},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_2001__58_4_52870/}
}