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@article{CMH_1942__15_138811, author = {Hans Bieri}, title = {Invariante {Herleitung} der {Differentialgleichungen} f\"ur 3-fache {Orthogonalsysteme.}}, journal = {Commentarii mathematici Helvetici}, pages = {287--295}, publisher = {mathdoc}, volume = {15}, year = {1942}, zbl = {0027.34501}, url = {http://geodesic.mathdoc.fr/item/CMH_1942__15_138811/} }
Hans Bieri. Invariante Herleitung der Differentialgleichungen für 3-fache Orthogonalsysteme.. Commentarii mathematici Helvetici, Tome 15 (1942), pp. 287-295. http://geodesic.mathdoc.fr/item/CMH_1942__15_138811/