@article{CMH_1953__27_139065,
     author = {Peter Henrici},
     title = {Zur {Funktionentheorie} der {Wellengleichung.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {235--293},
     year = {1953},
     volume = {27},
     zbl = {0052.33002},
     url = {http://geodesic.mathdoc.fr/item/CMH_1953__27_139065/}
}