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Dedicated to ProfessorGottfried Köthe on his 60th birthday, December 25, 1965
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Douglis, A. On weak solutions of non-linear partial differential equations with real characteristics. Math. Ann. 163, 351–358 (1966). https://doi.org/10.1007/BF02052520
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DOI: https://doi.org/10.1007/BF02052520