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The first author was supported in part by the EC-project GADGET and the IHES in Buressur-Yvette. The second author was supported by the Sonderforschungsbereich 256 at the University of Bonn.
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Ballmann, W., Buyalo, S. Nonpositively curved metrics on 2-polyhedra. Math Z 222, 97–134 (1996). https://doi.org/10.1007/BF02621860
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DOI: https://doi.org/10.1007/BF02621860