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@article{JRAM_1973__259_151297, author = {Urs Kirchgraber}, title = {Uniform treatment of canonical perturbation theories.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {86--100}, publisher = {mathdoc}, volume = {259}, year = {1973}, zbl = {0253.70016}, url = {http://geodesic.mathdoc.fr/item/JRAM_1973__259_151297/} }
Urs Kirchgraber. Uniform treatment of canonical perturbation theories.. Journal für die reine und angewandte Mathematik, Tome 259 (1973), pp. 86-100. http://geodesic.mathdoc.fr/item/JRAM_1973__259_151297/