%0 Journal Article %A Song, Seok-Zun %A Park, Kwon-Ryong %T Extreme preservers of maximal column rank inequalities of matrix sums over semirings %J Czechoslovak Mathematical Journal %D 2008 %P 693-703 %V 58 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMJ_2008__58_3_a7/ %G en %F CMJ_2008__58_3_a7