@article{ELA_2005__13__a4,
     author = {B{\i}y{\i}ko\u{g}lu, T\"urker and Leydold, Josef and Stadler, Peter F.},
     title = {Nodal domain theorems and bipartite subgraphs},
     journal = {The electronic journal of linear algebra},
     pages = {344--351},
     publisher = {mathdoc},
     volume = {13},
     year = {2005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ELA_2005__13__a4/}
}