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Dedicated to Professor Shmuel Agmon
Partially supported by NSF grant DMS 8320478
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Donnelly, H. Asymptotic properties of eigenfunctions— the hyperbolic plane. J. Anal. Math. 58, 135–151 (1992). https://doi.org/10.1007/BF02790361
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DOI: https://doi.org/10.1007/BF02790361