%0 Journal Article %A Kaczorek, T. %T Reduced-order perfect nonlinear observers of fractional descriptor discrete-time nonlinear systems %J International Journal of Applied Mathematics and Computer Science %D 2017 %P 245-251 %V 27 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/IJAMCS_2017_27_2_a1/ %G en %F IJAMCS_2017_27_2_a1