TY  - RPRT
TI  - ON THE BASIC APPROXIMATION THEOREM FOR SEMIGROUPS OF LINEAR OPERATORS.
AU  - C Foias
AU  - G Gussi
AU  - V Poenaru
PY  - 1957
DO  - 10.1073/pnas.43.7.616
UR  - https://pubmed.ncbi.nlm.nih.gov/16590065/
ID  - 16590065
ER  -