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@article{MAN_1989__285_1_164607, author = {Christian C. Fenske}, title = {An index for periodic orbits of functional differential equations.}, journal = {Mathematische Annalen}, pages = {381--392}, publisher = {mathdoc}, volume = {285}, number = {1}, year = {1989}, zbl = {0663.34057}, url = {http://geodesic.mathdoc.fr/item/MAN_1989__285_1_164607/} }
Christian C. Fenske. An index for periodic orbits of functional differential equations.. Mathematische Annalen, Tome 285 (1989) no. 1, pp. 381-392. http://geodesic.mathdoc.fr/item/MAN_1989__285_1_164607/