Eugen Czeizler Jarkko Kari A tight linear bound on the synchronization delay of bijective automata. 23-36 2007 380 Theor. Comput. Sci. 1-2 http://dx.doi.org/10.1016/j.tcs.2007.02.052 db/journals/tcs/tcs380.html#CzeizlerK07