@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/}
}