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@article{JRAM_1980__314_152214, author = {Werner-Georg Nowak}, title = {A non-convex generalization of the circle problem.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {136--145}, publisher = {mathdoc}, volume = {314}, year = {1980}, zbl = {0417.10042}, url = {http://geodesic.mathdoc.fr/item/JRAM_1980__314_152214/} }
Werner-Georg Nowak. A non-convex generalization of the circle problem.. Journal für die reine und angewandte Mathematik, Tome 314 (1980), pp. 136-145. http://geodesic.mathdoc.fr/item/JRAM_1980__314_152214/