TY  - JOUR
AU  - Foiaş, Ciprian
TI  - On Hille's spectral theory and operational calculus for semi-groups of operators in Hilbert space
JO  - Compositio Mathematica
PY  - 1959-1960
SP  - 71
EP  - 73
VL  - 14
PB  - Kraus Reprint
UR  - http://www.numdam.org/item/CM_1959-1960__14__71_0/
LA  - en
ID  - CM_1959-1960__14__71_0
ER  -