@article{10_37236_1021,
     author = {Vladimir Nikiforov},
     title = {The spectral radius of subgraphs of regular graphs},
     journal = {The electronic journal of combinatorics},
     year = {2007},
     volume = {14},
     doi = {10.37236/1021},
     zbl = {1157.05313},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1021/}
}