@article{GDZPPN002061503,
title = {A Criterion for a Meromorphic Function to be Normal},
journal = {Commentarii mathematici Helvetici},
volume = {49},
year = {1974},
pages = {492-495},
zbl = {0292.30029},
url = {http://dml.mathdoc.fr/item/GDZPPN002061503}
}
Lappan, Peter. A Criterion for a Meromorphic Function to be Normal. Commentarii mathematici Helvetici, Tome 49 (1974) pp. 492-495. http://gdmltest.u-ga.fr/item/GDZPPN002061503/