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@article{MZ_1963__82_170175, author = {Erik Ellentuck}, title = {Solution of a problem of {R.} {Friedberg.}}, journal = {Mathematische Zeitschrift}, pages = {101--103}, publisher = {mathdoc}, volume = {82}, year = {1963}, url = {http://geodesic.mathdoc.fr/item/MZ_1963__82_170175/} }
Erik Ellentuck. Solution of a problem of R. Friedberg.. Mathematische Zeitschrift, Tome 82 (1963), pp. 101-103. http://geodesic.mathdoc.fr/item/MZ_1963__82_170175/