@article{GDZPPN002281600, title = {Elementare Behandlung des Helmholtzschen Raumproblems}, journal = {Mathematische Annalen}, volume = {120}, year = {1947}, pages = {492-501}, zbl = {0034.23702}, url = {http://dml.mathdoc.fr/item/GDZPPN002281600} }
Pickert, Günter. Elementare Behandlung des Helmholtzschen Raumproblems. Mathematische Annalen, Tome 120 (1947) pp. 492-501. http://gdmltest.u-ga.fr/item/GDZPPN002281600/