%0 Journal Article %A M. I. Monastyrsky %T Hecke graphs, Ramanujan graphs and generalized duality transformations for lattice spin systems %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 2011 %P 295-300 %V 275 %I mathdoc %U http://geodesic.mathdoc.fr/item/TM_2011_275_a18/ %G en %F TM_2011_275_a18