来源：Journal d Analyse Mathematique, 2012, 117: 129-132.
DOI：10.1007/s11854-012-0017-3
摘要
The aim of this paper is to provide a quantitative version of a normality criterion recently given by Grahl and Nevo [GN] and a new proof of it based on the Schwarzian derivative and associated linear differential equation.
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