Babette van Antwerpen-de Fluiter, Emile H. L. Aarts, Jan H. M. Korst, Wim F. J. Verhaegh, Albert van der Werf. The complexity of generalized retiming problems. IEEE Trans. on CAD of Integrated Circuits and Systems, 15(11):1340-1353, 1996. [doi]
Abstract is missing.