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http://journals.cambridge.org/action/displayAbstract?aid=19053
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A. Z. GRINSHPAN
and CH. POMMERENKE
(1997).
THE GRUNSKY NORM AND SOME COEFFICIENT ESTIMATES FOR BOUNDED FUNCTIONS. Bulletin of the London Mathematical Society, 29
,
pp 705-712
doi:10.1112/S0024609397003524