Tactical configurations and their generic ring
European Journal of Combinatorics
The expected capacity of concentrators
SIAM Journal on Discrete Mathematics
Existence and explicit constructions of q+1 regular Ramanujan graphs for every prime power q
Journal of Combinatorial Theory Series B
SIAM Journal on Discrete Mathematics
Cayley graphs: eigenvalues, expanders and random walks
Surveys in combinatorics, 1995
Spectra of regular graphs and hypergraphs and orthogonal polynomials
European Journal of Combinatorics
Explicit constructions of Ramanujan complexes of type Ad
European Journal of Combinatorics - Special issue on combinatorics and representation theory
Overlap properties of geometric expanders: extended abstract
Proceedings of the twenty-second annual ACM-SIAM symposium on Discrete Algorithms
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We study finite graphs which are covered by the 1-skeleton of a building of type Ãn and with an extremal spectral property: they are Ãn-Ramanujan in the sense of Lubotzky. That definition is made quantitatively explicit, refined in the directed case, and a few candidates are suggested.