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@article{MOMA_1980__89_177973, author = {Hans G\"unther Kopetzky}, title = {Rationale {Approximationen} am {Einheitskreis.}}, journal = {Monatshefte f\"ur Mathematik}, pages = {293--300}, publisher = {mathdoc}, volume = {89}, year = {1980}, zbl = {0426.10042}, url = {http://geodesic.mathdoc.fr/item/MOMA_1980__89_177973/} }
Hans Günther Kopetzky. Rationale Approximationen am Einheitskreis.. Monatshefte für Mathematik, Tome 89 (1980), pp. 293-300. http://geodesic.mathdoc.fr/item/MOMA_1980__89_177973/