@article{10_4153_CJM_2014_019_5,
     author = {Graham, Robert and Pichot, Mikael},
     title = {A {Free} {Product} {Formula} for the {Sofic} {Dimension}},
     journal = {Canadian journal of mathematics},
     pages = {369--403},
     year = {2015},
     volume = {67},
     number = {2},
     doi = {10.4153/CJM-2014-019-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-2014-019-5/}
}