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@article{10_4064_fm_79_1_1_10, author = {Peter Hinman}, title = {The finite levels of the hierarchy of effective {R-sets}}, journal = {Fundamenta Mathematicae}, pages = {1--10}, publisher = {mathdoc}, volume = {79}, number = {1}, year = {1973}, doi = {10.4064/fm-79-1-1-10}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-79-1-1-10/} }
Peter Hinman. The finite levels of the hierarchy of effective R-sets. Fundamenta Mathematicae, Tome 79 (1973) no. 1, pp. 1-10. doi : 10.4064/fm-79-1-1-10. http://geodesic.mathdoc.fr/articles/10.4064/fm-79-1-1-10/
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