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@article{MAN_1930__103_159417, author = {M. Morse}, title = {A generalization of the {Sturm.} {Separation} und {Comparison} {Theorems} in n-space}, journal = {Mathematische Annalen}, pages = {52--69}, publisher = {mathdoc}, volume = {103}, year = {1930}, zbl = {56.1078.03}, url = {http://geodesic.mathdoc.fr/item/MAN_1930__103_159417/} }
M. Morse. A generalization of the Sturm. Separation und Comparison Theorems in n-space. Mathematische Annalen, Tome 103 (1930), pp. 52-69. http://geodesic.mathdoc.fr/item/MAN_1930__103_159417/