@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/}
}