@article{CRMATH_2004__339_8_533_0,
     author = {Alpay, Daniel and Kalyuzhny{\i}̆-Verbovetzki{\i}̆, Dmitry S.},
     title = {On the intersection of null spaces for matrix substitutions in a non-commutative rational formal power series},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {533--538},
     publisher = {Elsevier},
     volume = {339},
     number = {8},
     year = {2004},
     doi = {10.1016/j.crma.2004.08.005},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2004.08.005/}
}