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Propagation of zeroes and uniqueness in the Cauchy problem for first order partial differential equations. (English) Zbl 0199.15903

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[2] Malgrange, B., Sur les ouverts convexes par rapport à un opérateur différentiel. C.R. Acad. Sci. Paris 254, 614–615 (1962). · Zbl 0117.06301
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