%0 Journal Article %A L. Kirby %A K. McAllon %A R. Murawski %T Indicators, recursive saturation and expandability %J Fundamenta Mathematicae %D 1981 %P 127-139 %V 114 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-114-2-127-139/ %R 10.4064/fm-114-2-127-139 %G en %F 10_4064_fm_114_2_127_139