Cospectral graphs on 12 vertices. Brouwer, A.E.; Spence, E. — 2009 The Electronic Journal of Combinatorics [electronic only]
Polarities of G. Higman's symmetric design and a strongly regular graph on 176 vertices. A.E. Brouwer — 1982 Aequationes mathematicae
A Hilton-Milner theorem for vector spaces. Blokhuis, A.; Brouwer, A.E.; Chowdhury, A.; Frankl, P.; Mussche, T.; Patkós, B.; Szönyi, T. — 2010 The Electronic Journal of Combinatorics [electronic only]