%0 Journal Article %A Leo Harrington %T Extensions of countable infinitary logic which preserve most of its nice properties. %J Archiv für mathematische Logik und Grundlagenforschung %D 1980 %P 95-102 %V 20 %I mathdoc %U http://geodesic.mathdoc.fr/item/AMLG_1980__20_137964/ %F AMLG_1980__20_137964