%0 Journal Article %A Albert, J. %T A note on the undecidability of contextfreeness %J RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications %D 1982 %P 3-11 %V 16 %N 1 %I EDP-Sciences %U http://geodesic.mathdoc.fr/item/ITA_1982__16_1_3_0/ %G en %F ITA_1982__16_1_3_0