%0 Journal Article %A Kontak, Marcin %A Szmidt, Janusz %T Nonlinearity of the round function %J Control and Cybernetics %D 2007 %P 1037-1044 %V 36 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/CC_2007_36_4_a8/ %G en %F CC_2007_36_4_a8