@article{CMJ_2006__56_3_a7,
     author = {Zhang, Fuji and Chen, Zhibo},
     title = {Limit points of eigenvalues of (di)graphs},
     journal = {Czechoslovak Mathematical Journal},
     pages = {895--902},
     publisher = {mathdoc},
     volume = {56},
     number = {3},
     year = {2006},
     mrnumber = {2261661},
     zbl = {1164.05412},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/item/CMJ_2006__56_3_a7/}
}