TY  - RPRT
TI  - Linear Transformations in Hilbert Space: III. Operational Methods and Group Theory.
AU  - M H Stone
PY  - 1930
DO  - 10.1073/pnas.16.2.172
UR  - https://pubmed.ncbi.nlm.nih.gov/16587545/
ID  - 16587545
ER  -