%0 Journal Article %A Yu. A. Al'pin %A V. S. Al'pina %T Combinatorial properties of irreducible semigroups of nonnegative matrices %J Zapiski Nauchnykh Seminarov POMI %D 2012 %P 13-23 %V 405 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZNSL_2012_405_a1/ %G ru %F ZNSL_2012_405_a1