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This is an update request for the document Some notes on maximal arc intersection of spherical polygons: itsĀ  $\mathcal{NP}$ -hardness and approximation algorithms by Yong-Jin Liu, Wen-Qi Zhang and Kai Tang

Your paper was deposited in MUCC (Crossref) and appears online at http://link.springer.com/content/pdf/10.1007/s00371-009-0406-5.pdf
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