%0 Journal Article %A Farid Ammar-Khodja %A Giuseppe Geymonat %A Arnaud Münch %T On the exact controllability of a system of mixed order with essential spectrum %J Comptes Rendus. Mathématique %D 2008 %P 629-634 %V 346 %N 11-12 %I Elsevier %R 10.1016/j.crma.2008.04.009 %G en %F CRMATH_2008__346_11-12_629_0