Knauer, Ulrich. Algebraic graph theory : morphisms, monoids, and matrices / by Ulrich Knauer. - Berlin ; Boston : De Gruyter, c2011. - p. cm. - De Gruyter studies in mathematics ; 41 . ISBN: 9783110254082 (alk. paper) Subjects--Topical Terms: Graph theory.Algebraic topology. Universal Decimal Class. No.: 519.17 / KNA