%0 Journal Article %A Michel Brion %T Commutative Algebraic Groups up to Isogeny %J Documenta mathematica %D 2017 %P 679-725 %V 22 %U http://geodesic.mathdoc.fr/articles/10.4171/dm/576/ %R 10.4171/dm/576 %F 10_4171_dm_576