TY  - RPRT
TI  - A Uniqueness Theorem for Eigenfunction Expansions.
AU  - S Minakshisundaram
PY  - 1947
DO  - 10.1073/pnas.33.4.76
UR  - https://pubmed.ncbi.nlm.nih.gov/16578249/
ID  - 16578249
ER  -