%0 Journal Article %A Arabas, P. %A Malinowski, K. %T Periodic Coordination in Hierarchical Air Defence Systems %J International Journal of Applied Mathematics and Computer Science %D 2001 %P 493-513 %V 11 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/IJAMCS_2001_11_2_a9/ %G en %F IJAMCS_2001_11_2_a9