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@article{MS2_1989__64_2_186113, author = {Vagn Lundsgaard Hansen}, title = {The characteristic algebra of a polynomial covering map.}, journal = {Mathematica Scandinavica}, pages = {219--225}, publisher = {mathdoc}, volume = {64}, number = {2}, year = {1989}, zbl = {0699.46036}, url = {http://geodesic.mathdoc.fr/item/MS2_1989__64_2_186113/} }
Vagn Lundsgaard Hansen. The characteristic algebra of a polynomial covering map.. Mathematica Scandinavica, Tome 64 (1989) no. 2, pp. 219-225. http://geodesic.mathdoc.fr/item/MS2_1989__64_2_186113/