[1] |
Carter, R. W., Simple groups of Lie type (1972), Wiley · Zbl 0248.20015 |
[2] |
Chang, L. C., Association schemes of partially balanced blocks designs with parameters \(v = 28, n_1 = 12, n_2 = 15\) and \(p_{11}^2 = 4\), Sci. Record, 4, 12-18 (1960) · Zbl 0093.32101 |
[3] |
Collatz, L.; Sinogowitz, U., Spektren endlicher Grafen, Abh. Math. Sem. Hamburg, 21, 63-77 (1957) · Zbl 0077.36704 |
[4] |
Coxeter, H. S.M, Regular Polytopes (1973), Dover: Dover New York · Zbl 0258.05119 |
[5] |
Delsarte, P.; Goethals, J. M.; Seidel, J. J., Bounds for systems of lines, and Jacobi polynomials, Philips Research Reports, 30, 91∗-105∗ (1975) · Zbl 0322.05023 |
[6] |
Doob, M., On characterizing certain graphs with four eigenvalues by their spectra, Linear Algebra and Appl., 3, 461-482 (1970) · Zbl 0202.55703 |
[7] |
Doob, M., A spectral characterization of the line graph of a BIBD with λ = 1, Linear Algebra and Appl., 12, 11-20 (1975) · Zbl 0364.05009 |
[8] |
Hall, M., Combinatorial theory (1967), Blaisdell: Blaisdell Waltham, Mass · Zbl 0196.02401 |
[9] |
Hoffman, A. J., On the polynomial of a graph, Amer. Math. Monthly, 70, 30-36 (1963) · Zbl 0112.14901 |
[10] |
Hoffman, A. J., − 1 − √2 ?, (Guy, R., Combinatorial Structures and their Applications (1970), Gordon & Breach: Gordon & Breach New York), 173-176 · Zbl 0328.15001 |
[11] |
A. J. Hoffman; A. J. Hoffman · Zbl 0354.05048 |
[12] |
Hoffman, A. J., Eigenvalues of graphs, (Fulkerson, D. R., Graph Theory (1976), M.A.A) · Zbl 0357.05068 |
[13] |
A. J. Hoffman and D. K. Ray Chaudhuri; A. J. Hoffman and D. K. Ray Chaudhuri |
[14] |
Hoffman, A. J.; Chaudhuri, D. K.Ray, On the line graph of a symmetric balanced incomplete block design, Trans. Amer. Math. Soc., 116, 238-252 (1965) · Zbl 0144.23303 |
[15] |
Lemmens, P. W.H; Seidel, J. J., Equiangular lines, J. Algebra, 24, 494-512 (1973) · Zbl 0255.50005 |
[16] |
van Lint, J. H.; Seidel, J. J., Equilateral point sets in elliptic geometry, (Nederl. Akad. Wetensch. Proc. Ser. A, 69 (1966)), 335-348, (Indag. Math.28) · Zbl 0138.41702 |
[17] |
Norman, C. W., A characterization of the Mathieu group \(M_{11}\), Math. Z., 106, 162-166 (1968) · Zbl 0164.33101 |
[18] |
Chaudhuri, D. K.Ray, Characterization of line graphs, J. Combinatorial Theory, 3, 201-214 (1967) · Zbl 0149.41304 |
[19] |
Seidel, J. J., Strongly regular graphs with (− 1,1,0)-adjacency matrix having eigenvalue 3, Linear Algebra Appl., 1, 281-298 (1968) · Zbl 0159.25403 |
[20] |
Seidel, J. J., Strongly regular graphs, (Tutte, W. T., Progress in Combinatorics (1969), Academic Press: Academic Press New York), 185-197 · Zbl 0431.05018 |
[21] |
Seidel, J. J., On two-graphs and Shult’s characterization of symplectic and orthogonal geometries over GF(2), (T. H. Report 73-WSK-02 (1973), Techn. Univ. Eindhoven) · Zbl 0273.05130 |
[22] |
Seidel, J. J., (Graphs and two-graphs, 5th Southeastern Confer. on Combinatorics, Graph theory, Computing (1974), Utilitas Math. Publ. Inc.,: Utilitas Math. Publ. Inc., Winnipeg, Canada), 125-143 · Zbl 0308.05120 |
[23] |
Shrikhande, S. S., The uniqueness of the \(L_2\) association scheme, Ann. Math. Statist., 30, 781-798 (1959) · Zbl 0086.34802 |
[24] |
Shult, E. E., Characterizations of certain classes of graphs, J. Combinatorial Theory (B), 13, 142-167 (1972) · Zbl 0238.05120 |