@article{10_21136_CMJ_1965_100673,
     author = {Clark, W. Edwin},
     title = {Remarks on the kernel of a matrix semigroup},
     journal = {Czechoslovak Mathematical Journal},
     pages = {305--310},
     publisher = {mathdoc},
     volume = {15},
     number = {2},
     year = {1965},
     doi = {10.21136/CMJ.1965.100673},
     mrnumber = {0177047},
     zbl = {0135.03803},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1965.100673/}
}