%0 Journal Article %A Romagny, Matthieu %A Rydh, David %A Zalamansky, Gabriel %T The Complexity of a Flat Groupoid %J Documenta mathematica %D 2018 %P 1157-1196 %V 23 %I mathdoc %U http://geodesic.mathdoc.fr/item/DOCMA_2018__23__a28/ %G en %F DOCMA_2018__23__a28