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@article{MAN_1883__21_157075, author = {Sturm}, title = {Ueber den integrirenden {Factor} der elliptischen {Differentialgleichung} .}, journal = {Mathematische Annalen}, pages = {446--453}, publisher = {mathdoc}, volume = {21}, year = {1883}, url = {http://geodesic.mathdoc.fr/item/MAN_1883__21_157075/} }
Sturm. Ueber den integrirenden Factor der elliptischen Differentialgleichung .. Mathematische Annalen, Tome 21 (1883), pp. 446-453. http://geodesic.mathdoc.fr/item/MAN_1883__21_157075/