%0 Journal Article %A Fernando Cobos %A Oscar Domínguez %A Antón Martínez %T Compact operators and approximation spaces %J Colloquium Mathematicum %D 2014 %P 1-11 %V 136 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm136-1-1/ %R 10.4064/cm136-1-1 %G en %F 10_4064_cm136_1_1