%0 Journal Article %A Knopik, Leszek %T Some results on the ageing class %J Control and Cybernetics %D 2005 %P 1175-1180 %V 34 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/CC_2005_34_4_a10/ %G en %F CC_2005_34_4_a10