@article{ELA_1996__1__a3,
     author = {Fricke, Gerd H. and Hedetniemi, Stephen T. and Jacobs, David P. and Trevisan, Vilmar},
     title = {Reducing the adjacency matrix of a tree},
     journal = {The electronic journal of linear algebra},
     pages = {34--43},
     publisher = {mathdoc},
     volume = {1},
     year = {1996},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ELA_1996__1__a3/}
}