@article{10_4064_sm144_3_1,
     author = {Brian Jefferies},
     title = {Exponential bounds for noncommuting systems of matrices},
     journal = {Studia Mathematica},
     pages = {197--207},
     year = {2001},
     volume = {144},
     number = {3},
     doi = {10.4064/sm144-3-1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm144-3-1/}
}