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@article{MZ_1964__86_170350, author = {Wayne, H. Richter}, title = {Regressive sets of order n.}, journal = {Mathematische Zeitschrift}, pages = {372--374}, publisher = {mathdoc}, volume = {86}, year = {1964}, zbl = {0207.30801}, url = {http://geodesic.mathdoc.fr/item/MZ_1964__86_170350/} }
Wayne, H. Richter. Regressive sets of order n.. Mathematische Zeitschrift, Tome 86 (1964), pp. 372-374. http://geodesic.mathdoc.fr/item/MZ_1964__86_170350/