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Research supported by N.S.F. Grant G-7412.
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Cohn, H. How perturbations satisfying Hilbert’s modular group affect the invariant metric. J. Anal. Math. 18, 53–59 (1967). https://doi.org/10.1007/BF02798034
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DOI: https://doi.org/10.1007/BF02798034