%0 Journal Article %A Emirsajłow, Zbigniew %T Discrete-time output observers for boundary control systems %J International Journal of Applied Mathematics and Computer Science %D 2021 %P 613-626 %V 31 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/IJAMCS_2021_31_4_a5/ %G en %F IJAMCS_2021_31_4_a5