1. Nonnegative Matrices in the Mathematical Sciences;Berman,1979
2. H. Gessesse, A.I. Popov, H. Radjavi, E. Spinu, A. Tcaciuc, V.G. Troitsky, Bounded indecomposable semigroups of non-negative matrices, Positivity, in press, doi:10.1007/s11117-009-0024-5.
3. The Engel–Kolchin Theorem Revisited, Contributions to Algebra (Collection of Papers Dedicated to Ellis Kolchin);Kaplansky,1977
4. L. Livshits, G. MacDonald, H. Radjavi, Positive matrix semigroups with binary diagonals, preprint.
5. On permutability and submultiplicativity of spectral radius;Longstaff;Canad. J. Math.,1995