@article{ELA_2003__10__a4,
     author = {DeAlba, Luz Maria and Hardy, Timothy L. and Hogben, Leslie and Wangsness, Amy},
     title = {The (weakly) sign symmetric $P$-matrix completion problems},
     journal = {The electronic journal of linear algebra},
     pages = {257--271},
     publisher = {mathdoc},
     volume = {10},
     year = {2003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ELA_2003__10__a4/}
}