@article{10_37236_3305,
     author = {Miquel \`Angel Fiol},
     title = {The spectral excess theorem for distance-biregular graphs.},
     journal = {The electronic journal of combinatorics},
     year = {2013},
     volume = {20},
     number = {3},
     doi = {10.37236/3305},
     zbl = {1295.05272},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/3305/}
}