%0 Journal Article %A Chun Guang Li %A Ting Ting Zhou %T Polaroid type operators and compact perturbations %J Studia Mathematica %D 2014 %P 175-192 %V 221 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm221-2-5/ %R 10.4064/sm221-2-5 %G en %F 10_4064_sm221_2_5