@article{MM2_1991__73_1_155660,
     author = {Rentaro Agemi},
     title = {Blow-Up of solutions to nonlinear wave equations in two space dimensions.},
     journal = {Manuscripta mathematica},
     pages = {153--162},
     year = {1991},
     volume = {73},
     number = {1},
     zbl = {0763.35060},
     url = {http://geodesic.mathdoc.fr/item/MM2_1991__73_1_155660/}
}