@article{DMGT_2007_27_2_a12,
     author = {Zhou, Jun and Fan, Yi-Zheng and Wang, Yi},
     title = {On the second largest eigenvalue of a mixed graph},
     journal = {Discussiones Mathematicae. Graph Theory},
     pages = {373--384},
     publisher = {mathdoc},
     volume = {27},
     number = {2},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGT_2007_27_2_a12/}
}