@article{MZ_1943__49_169043,
     author = {H. Wittich},
     title = {Ganze {L\"osungen} der {Differentialgleichung} ?u=eu},
     journal = {Mathematische Zeitschrift},
     pages = {579--582},
     year = {1943},
     volume = {49},
     zbl = {0028.41001},
     url = {http://geodesic.mathdoc.fr/item/MZ_1943__49_169043/}
}