TY  - RPRT
TI  - THE EIGENFUNCTION EXPANSION THEOREM FOR THE GENERAL SELF-ADJOINT SINGULAR ELLIPTIC PARTIAL DIFFERENTIAL OPERATOR. I. THE ANALYTICAL FOUNDATION.
AU  - F E Browder
PY  - 1954
DO  - 10.1073/pnas.40.6.454
UR  - https://pubmed.ncbi.nlm.nih.gov/16589505/
ID  - 16589505
ER  -