Given a k-graph Lambda and an element p of N-k, we define the dual k-graph, p Lambda. We show that when Lambda is row-finite and has no sources, the C*-algebras C*(Lambda) and C*(p Lambda) coincide. We use this isomorphism to apply Robertson and Steger's results to calculate the K-theory of C*(Lambda) when Lambda is finite and strongly connected and satisfies the aperiodicity condition.
Proceedings of the American Mathematical Society Vol. 134, no. 2, p. 455-464