Peter C. Dillinger Panagiotis Manolios Daron Vroon J. Strother Moore 3-18 2007 174 Electr. Notes Theor. Comput. Sci. 2 http://dx.doi.org/10.1016/j.entcs.2006.09.018 db/journals/entcs/entcs174.html#DillingerMVM07