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Dedicated to ProfessorGottfried Köthe on the occasion of his Sixtieth Birthday, December 25, 1965
This research was supported in part by the National Science Foundation through the grant GP-4493.
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Aziz, A.K., Maloney, J.P. An application of Tychonoff's fixed point theorem to hyperbolic partial differential equations. Math. Ann. 162, 77–82 (1965). https://doi.org/10.1007/BF01361934
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DOI: https://doi.org/10.1007/BF01361934