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2. Rüdiger W. Braun, Reinhold Meise, and B. A. Taylor. The geometry of analytic varieties satisfying the local Phragmén-Lindelöf condition and a geometric characterization of the partial differential operators that are surjective on $A(\bf R^4)$. Trans. Amer. Math. Soc., 356(4):1315-1383 (electronic), 2004. ISSN: 0002-9947.

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