@article{ELA_2009__18__a40,
     author = {Johnson, Charles R. and Costas-Santos, Roberto S. and Tadchiev, Boris},
     title = {Matrices totally positive relative to a tree},
     journal = {The electronic journal of linear algebra},
     pages = {211--221},
     publisher = {mathdoc},
     volume = {18},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ELA_2009__18__a40/}
}