@article{10_4064_sm203_1_4,
     author = {Leo Livshits and Gordon MacDonald and Heydar Radjavi},
     title = {Universal bounds for matrix semigroups},
     journal = {Studia Mathematica},
     pages = {69--77},
     publisher = {mathdoc},
     volume = {203},
     number = {1},
     year = {2011},
     doi = {10.4064/sm203-1-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm203-1-4/}
}