@article{DM_1999_11_3_a3,
     author = {S. V. Savchenko},
     title = {On the spectra of connected graphs},
     journal = {Diskretnaya Matematika},
     pages = {29--47},
     publisher = {mathdoc},
     volume = {11},
     number = {3},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1999_11_3_a3/}
}