@article{JRAM_1968__232_150879,
     author = {Ulrich Staude},
     title = {Periodische {L\"osungen} von nichtlinearen elliptischen {Differentialgleichungen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {156--172},
     publisher = {mathdoc},
     volume = {232},
     year = {1968},
     zbl = {0172.14803},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1968__232_150879/}
}