%0 Journal Article %A Baues, Oliver %T Finite extensions and unipotent shadows of affine crystallographic groups %J Comptes Rendus. Mathématique %D 2002 %P 785-788 %V 335 %N 10 %I Elsevier %U http://www.numdam.org/articles/10.1016/S1631-073X(02)02562-1/ %R 10.1016/S1631-073X(02)02562-1 %G en %F CRMATH_2002__335_10_785_0