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Tohutoro APA (7th ed.)
Neri, U. (1968). ELLIPTIC OPERATORS OF HIGHER ORDER IN DIVERGENCE FORM. Proc Natl Acad Sci U S A.
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Tohutoru Kātū Chicago (17th ed.)
Neri, Umberto. "ELLIPTIC OPERATORS OF HIGHER ORDER IN DIVERGENCE FORM."
Proc Natl Acad Sci U S A 1968.
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Tohutoro MLA (9th ed.)
Neri, Umberto. "ELLIPTIC OPERATORS OF HIGHER ORDER IN DIVERGENCE FORM."
Proc Natl Acad Sci U S A, 1968.
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