@article{ELA_2011__22__a64,
     author = {Hogben, Leslie},
     title = {A note on minimum rank and maximum nullity of sign patterns},
     journal = {The electronic journal of linear algebra},
     pages = {203--213},
     publisher = {mathdoc},
     volume = {22},
     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ELA_2011__22__a64/}
}