@article{AFM_1973_521-560_a17,
     author = {Joachim Jaenicke},
     title = {Bemerkung \"uber die {Singularit\"at} von {L\"osungen} der ersten {Randwertaufgabe} hyperbolischer {Differentialgleichungen}},
     journal = {Annales Fennici Mathematici},
     year = {1973},
     volume = {521-560},
     doi = {10.5186/aasfm.1973.543},
     language = {de},
     url = {http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1973.543/}
}