%0 Journal Article %A Medková, Dagmar %T On essential norm of the Neumann operator %J Mathematica Bohemica %D 1992 %P 393-408 %V 117 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/MB.1992.126064/ %R 10.21136/MB.1992.126064 %G en %F 10_21136_MB_1992_126064