%0 Journal Article %A Galeana-Sanchez, Hortensia %A Pastrana, Laura %T k-Kernels and some operations in digraphs %J Discussiones Mathematicae. Graph Theory %D 2009 %P 39-49 %V 29 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DMGT_2009_29_1_a2/ %G en %F DMGT_2009_29_1_a2