@article{CMJ_2008__58_3_a7,
     author = {Song, Seok-Zun and Park, Kwon-Ryong},
     title = {Extreme preservers of maximal column rank inequalities of matrix sums over semirings},
     journal = {Czechoslovak Mathematical Journal},
     pages = {693--703},
     publisher = {mathdoc},
     volume = {58},
     number = {3},
     year = {2008},
     mrnumber = {2455931},
     zbl = {1174.15001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2008__58_3_a7/}
}