@article{ELA_2011__22__a1,
     author = {Gao, Yubin and Shao, Yanling},
     title = {Inertially arbitrary tree sign patterns of order 4},
     journal = {The electronic journal of linear algebra},
     pages = {1148--1155},
     publisher = {mathdoc},
     volume = {22},
     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ELA_2011__22__a1/}
}