@article{MM2_1979__28_154638,
     author = {Fritz John},
     title = {Blow-Up of {Solutions} of {Nonlinear} {Wave} {Equations} in {Three} {Space} {Dimensions.}},
     journal = {Manuscripta mathematica},
     pages = {235--268},
     publisher = {mathdoc},
     volume = {28},
     year = {1979},
     zbl = {0406.35042},
     url = {http://geodesic.mathdoc.fr/item/MM2_1979__28_154638/}
}