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@article{MS2_1973__32_166292, author = {Erik Ellentuck}, title = {On the {Degrees} of {Universal} {Regressive} {Isols.}}, journal = {Mathematica Scandinavica}, pages = {145--164}, publisher = {mathdoc}, volume = {32}, year = {1973}, zbl = {0275.02040}, url = {http://geodesic.mathdoc.fr/item/MS2_1973__32_166292/} }
Erik Ellentuck. On the Degrees of Universal Regressive Isols.. Mathematica Scandinavica, Tome 32 (1973), pp. 145-164. http://geodesic.mathdoc.fr/item/MS2_1973__32_166292/