TY  - RPRT
TI  - ON THE OPERATIONAL CALCULUS WITH DIFFERENTIABLE FUNCTIONS.
AU  - L Nachbin
PY  - 1958
DO  - 10.1073/pnas.44.7.698
UR  - https://pubmed.ncbi.nlm.nih.gov/16590262/
ID  - 16590262
ER  -