@article{AM2_1982__25_136969,
     author = {C.D. Godsil and B.D. McKay},
     title = {Constructing cospectral graphs.},
     journal = {Aequationes mathematicae},
     pages = {257--268},
     publisher = {mathdoc},
     volume = {25},
     year = {1982},
     zbl = {0527.05051},
     url = {http://geodesic.mathdoc.fr/item/AM2_1982__25_136969/}
}