%0 Journal Article %A MARTIN R. BRIDSON %A HENRY WILTON %T UNDECIDABILITY AND THE DEVELOPABILITY OF PERMUTOIDS AND RIGID PSEUDOGROUPS %J Forum of Mathematics, Sigma %D 2017 %V 5 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.1017/fms.2017.6/ %R 10.1017/fms.2017.6 %G en %F 10_1017_fms_2017_6