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@article{JRAM_1967__225_150784, author = {Peter Lappan}, title = {A note on annular functions.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {207--208}, publisher = {mathdoc}, volume = {225}, year = {1967}, zbl = {0163.10002}, url = {http://geodesic.mathdoc.fr/item/JRAM_1967__225_150784/} }
Peter Lappan. A note on annular functions.. Journal für die reine und angewandte Mathematik, Tome 225 (1967), pp. 207-208. http://geodesic.mathdoc.fr/item/JRAM_1967__225_150784/