@article{ELA_2009__19__a0,
     author = {Catral, Minerva and Hogben, Leslie and Olesky, Dale D. and van den Driessche, Pauline},
     title = {Sign patterns that require or allow power-positivity},
     journal = {The electronic journal of linear algebra},
     pages = {121--128},
     publisher = {mathdoc},
     volume = {19},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ELA_2009__19__a0/}
}