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Centre for Mathematical Physics and Stochastics, funded by a grant from the Danish National Research Foundation. On leave from the Steklov Institute, St. Petersburg.
An erratum to this article can be found online at http://dx.doi.org/10.1007/BF02441083.
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Balslev, E., Venkov, A. Spectral theory of Laplacians for Hecke groups with primitive character. Acta Math. 186, 155–217 (2001). https://doi.org/10.1007/BF02401839
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DOI: https://doi.org/10.1007/BF02401839