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Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Browder F. E. THE EIGENFUNCTION EXPANSION THEOREM FOR THE GENERAL SELF-ADJOINT SINGULAR ELLIPTIC PARTIAL DIFFERENTIAL OPERATOR. I. THE ANALYTICAL FOUNDATION. Proc Natl Acad Sci U S A. 1954 Jun;40(6):454–459. doi: 10.1073/pnas.40.6.454. [DOI] [PMC free article] [PubMed] [Google Scholar]
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