@article{ELA_2005__13__a12,
     author = {Bru, Rafael and Pedroche, Francisco and Szyld, Daniel B.},
     title = {Subdirect sums of nonsingular $M$-matrices and of their inverses},
     journal = {The electronic journal of linear algebra},
     pages = {162--174},
     publisher = {mathdoc},
     volume = {13},
     year = {2005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ELA_2005__13__a12/}
}