TY  - JOUR
AU  - Andrzej Pokrzywa
TI  - Method of orthogonal projections and approximation of the spectrum of a bounded operator
JO  - Studia Mathematica
PY  - 1979
SP  - 21
EP  - 29
VL  - 65
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/sm-65-1-21-29/
DO  - 10.4064/sm-65-1-21-29
LA  - en
ID  - 10_4064_sm_65_1_21_29
ER  -