@article{10_1090_S0894_0347_1993_1168959_X,
     author = {Marcus, Brian and Tuncel, Selim},
     title = {Matrices of polynomials, positivity, and finite equivalence of {Markov} chains},
     journal = {Journal of the American Mathematical Society},
     pages = {131--147},
     publisher = {mathdoc},
     volume = {06},
     number = {1},
     year = {1993},
     doi = {10.1090/S0894-0347-1993-1168959-X},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-1993-1168959-X/}
}