TY  - JOUR
AU  - Michael Fisher
TI  - Fractional powers of operators and Bessel potentials on Hilbert space
JO  - Studia Mathematica
PY  - 1972
SP  - 191
EP  - 206
VL  - 41
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/sm-41-2-191-206/
DO  - 10.4064/sm-41-2-191-206
LA  - en
ID  - 10_4064_sm_41_2_191_206
ER  -