TY  - RPRT
TI  - EIGENFUNCTION EXPANSIONS FOR SINGULAR ELLIPTIC OPERATORS. II. THE HILBERT SPACE ARGUMENT; PARABOLIC EQUATIONS ON OPEN MANIFOLDS.
AU  - F E Browder
PY  - 1954
DO  - 10.1073/pnas.40.6.459
UR  - https://pubmed.ncbi.nlm.nih.gov/16589506/
ID  - 16589506
ER  -