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@article{CMH_1974__49_139596, author = {Peter Lappan}, title = {A {Criterion} for a {Meromorphic} {Function} to be {Normal}}, journal = {Commentarii mathematici Helvetici}, pages = {492--495}, publisher = {mathdoc}, volume = {49}, year = {1974}, zbl = {0292.30029}, url = {http://geodesic.mathdoc.fr/item/CMH_1974__49_139596/} }
Peter Lappan. A Criterion for a Meromorphic Function to be Normal. Commentarii mathematici Helvetici, Tome 49 (1974), pp. 492-495. http://geodesic.mathdoc.fr/item/CMH_1974__49_139596/