@article{ELA_2006__15__a27,
     author = {Marques de S\'a, Eduardo},
     title = {Some subpolytopes of the {Birkhoff} polytope},
     journal = {The electronic journal of linear algebra},
     pages = {1--7},
     publisher = {mathdoc},
     volume = {15},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ELA_2006__15__a27/}
}