@article{NUMA_1971__18_132098,
     author = {M. Lewin},
     title = {On {Exponents} of {Primitive} {Matrices.}},
     journal = {Numerische Mathematik},
     pages = {154--161},
     publisher = {mathdoc},
     volume = {18},
     year = {1971},
     zbl = {0212.05202},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1971__18_132098/}
}