%0 Journal Article %A Bahaa, G. M. %T Optimal control problem and maximum principle for fractional order cooperative systems %J Kybernetika %D 2019 %P 337-358 %V 55 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.14736/kyb-2019-2-0337/ %R 10.14736/kyb-2019-2-0337 %G en %F 10_14736_kyb_2019_2_0337