%0 Journal Article %A Mati Abel %A Wiesław Żelazko %T Topologically Invertible Elements and Topological Spectrum %J Bulletin of the Polish Academy of Sciences. Mathematics %D 2006 %P 257-271 %V 54 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ba54-3-7/ %R 10.4064/ba54-3-7 %G en %F 10_4064_ba54_3_7