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@article{JRAM_1973__264_151384, author = {Michael Fried}, title = {On a theorem of {Ritt} and related {Diophantine} problems.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {40--55}, publisher = {mathdoc}, volume = {264}, year = {1973}, zbl = {0278.12101}, url = {http://geodesic.mathdoc.fr/item/JRAM_1973__264_151384/} }
Michael Fried. On a theorem of Ritt and related Diophantine problems.. Journal für die reine und angewandte Mathematik, Tome 264 (1973), pp. 40-55. http://geodesic.mathdoc.fr/item/JRAM_1973__264_151384/