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@article{MAN_1928__98_159242, author = {H.P. Robertson}, title = {Bemerkungen \"uber separierbare {Systeme} in der {Wellenmechanik}}, journal = {Mathematische Annalen}, pages = {749--752}, publisher = {mathdoc}, volume = {98}, year = {1928}, zbl = {54.0963.05}, url = {http://geodesic.mathdoc.fr/item/MAN_1928__98_159242/} }
H.P. Robertson. Bemerkungen über separierbare Systeme in der Wellenmechanik. Mathematische Annalen, Tome 98 (1928), pp. 749-752. http://geodesic.mathdoc.fr/item/MAN_1928__98_159242/