$a Kp. Distance-regular graphs / A. E. Brouwer, A. M. Cohen, A. Neumaier. - Berlin, 1989.
670
$a LCC online
670
$a Spectra of graphs / Andries E. Brouwer, Willem H. Haemers. - New York, 2012. $b (Dept of Mathematics Eindhoven University of Technology, Eindhoven, The Netherlands)