Tom Brylawski, James Oxley Several identities for the characteristic polynomial of a combinatorial geometry. [Citation Graph (0, 0)][DBLP] Discrete Mathematics, 1980, v:31, n:2, pp:161-170 [Journal]

Manfred Schulz An example of a cubic graph with two orbits and simple eigenvalue sqrt(3). [Citation Graph (0, 0)][DBLP] Discrete Mathematics, 1980, v:31, n:2, pp:221-222 [Journal]

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