Text ( visual ) : unmediated Existence theorems in partial differential equations / by Dorothy L. Bernstein. -- New York : Kraus , 1965, c1950. -- vii, 228 p. ; 26 cm. -- (Annals of mathematics studies ; no. 23). -- Reprint. Originally published: Princeton University Press, 1950. -- (BA29639494) ; https://ci.nii.ac.jp/ncid/BA29639494 Author Heading(s): Bernstein, Dorothy Lewis

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