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@article{JRAM_1976__288_151805, author = {D.D. Bonar and K. Barth}, title = {An annular function whose derivative is not annular.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {146--151}, publisher = {mathdoc}, volume = {288}, year = {1976}, zbl = {0333.30019}, url = {http://geodesic.mathdoc.fr/item/JRAM_1976__288_151805/} }
D.D. Bonar; K. Barth. An annular function whose derivative is not annular.. Journal für die reine und angewandte Mathematik, Tome 288 (1976), pp. 146-151. http://geodesic.mathdoc.fr/item/JRAM_1976__288_151805/