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Herrn Prof. Dr.C. L. Siegel zum 70. Geburtstag gewidmet
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Günzler, H. Zur Regularität der Lösungen zweidimensionaler Wellengleichungen. Math. Ann. 169, 183–229 (1967). https://doi.org/10.1007/BF01399538
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DOI: https://doi.org/10.1007/BF01399538