@article{SM_2016_207_5_a0,
     author = {Yu. A. Al'pin and V. S. Al'pina},
     title = {Combinatorial structure of $k$-semiprimitive matrix families},
     journal = {Sbornik. Mathematics},
     pages = {639--651},
     year = {2016},
     volume = {207},
     number = {5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2016_207_5_a0/}
}