TY  - JOUR
AU  - Thorsten Kröncke
TI  - Extremal perturbations of semi-Fredholm operators
JO  - Studia Mathematica
PY  - 1998
SP  - 253
EP  - 264
VL  - 129
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/sm-129-3-253-264/
DO  - 10.4064/sm-129-3-253-264
LA  - en
ID  - 10_4064_sm_129_3_253_264
ER  -