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@article{MAN_1974__208_162561, author = {Dietrich Braess}, title = {Morse-Theorie f\"ur berandete {Mannigfaltigkeiten.}}, journal = {Mathematische Annalen}, pages = {133--148}, publisher = {mathdoc}, volume = {208}, year = {1974}, zbl = {0263.58005}, url = {http://geodesic.mathdoc.fr/item/MAN_1974__208_162561/} }
Dietrich Braess. Morse-Theorie für berandete Mannigfaltigkeiten.. Mathematische Annalen, Tome 208 (1974), pp. 133-148. http://geodesic.mathdoc.fr/item/MAN_1974__208_162561/