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HerrnHeinrich Tietze zum 70. Geburtstag am 31. August 1950 gewidmet
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Sauer, R. Projektive Beziehungen in der Charakteristikentheorie der partiellen Differentialgleichungen. Arch. Math 2, 420–423 (1949). https://doi.org/10.1007/BF02036947
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DOI: https://doi.org/10.1007/BF02036947