@article{JRAM_1982__333_152444,
     author = {Rainer Hempel},
     title = {Eine {Variationsmethode} f\"ur elliptische {Differentialoperatoren} mit strengen {Nichtlinearit\"aten.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {179--190},
     publisher = {mathdoc},
     volume = {333},
     year = {1982},
     zbl = {0477.35003},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1982__333_152444/}
}