%0 Journal Article
%A Širáň, Jozef
%T Coverings of graphs and maps, orthogonality, and eigenvectors
%J Journal of Algebraic Combinatorics
%D 2001
%P 57-72
%V 14
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/JAC_2001__14_1_a1/
%G en
%F JAC_2001__14_1_a1