@article{02239303, title = {Sets of cospectral graphs with least eigenvalue at least }, journal = {Bulletin. Classe des Sciences Math\'ematiques et Naturelles. Sciences Math\'ematiques}, volume = {129}, year = {2004}, pages = {85-102}, doi = {10.2298/BMAT0429085C}, zbl = {1077.05059}, language = {en}, url = {http://dml.mathdoc.fr/item/02239303} }
Cvetković, D.; Lepović, M. Sets of cospectral graphs with least eigenvalue at least . Bulletin. Classe des Sciences Mathématiques et Naturelles. Sciences Mathématiques, Tome 129 (2004) pp. 85-102. doi : 10.2298/BMAT0429085C. http://gdmltest.u-ga.fr/item/02239303/