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@article{JRAM_1973__260_151311, author = {F.T. Howard}, title = {Properties of the van der {Pol} numbers and polynomials.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {35--46}, publisher = {mathdoc}, volume = {260}, year = {1973}, zbl = {0254.10013}, url = {http://geodesic.mathdoc.fr/item/JRAM_1973__260_151311/} }
F.T. Howard. Properties of the van der Pol numbers and polynomials.. Journal für die reine und angewandte Mathematik, Tome 260 (1973), pp. 35-46. http://geodesic.mathdoc.fr/item/JRAM_1973__260_151311/