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. 1959 Sep;45(9):1423–1431. doi: 10.1073/pnas.45.9.1423
ON THE SPECTRAL THEORY OF STRONGLY ELLIPTIC DIFFERENTIAL OPERATORS*
1DEPARTMENT OF MATHEMATICS, YALE UNIVERSITY
*
The preparation of this paper was partially supported by the National Science Foundation under NSF Research Grant G8236.
PMCID: PMC222731 PMID: 16590522