MathSciNet bibliographic data MR320821 (47 #9354) 47F05 (35J30) Nirenberg, Louis; Walker, Homer F. The null spaces of elliptic partial differential operators in ${\bf R}\sp{n}$${\bf R}\sp{n}$. Collection of articles dedicated to Salomon Bochner. J. Math. Anal. Appl. 42 (1973), 271–301. Article

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