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@article{JRAM_1960__203_150417, author = {John A. Nohel}, title = {Stability of perturbed periodic motions.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {64--79}, publisher = {mathdoc}, volume = {203}, year = {1960}, zbl = {0099.29302}, url = {http://geodesic.mathdoc.fr/item/JRAM_1960__203_150417/} }
John A. Nohel. Stability of perturbed periodic motions.. Journal für die reine und angewandte Mathematik, Tome 203 (1960), pp. 64-79. http://geodesic.mathdoc.fr/item/JRAM_1960__203_150417/