Yousuke Takada Teijiro Isokawa Ferdinand Peper Nobuyuki Matsui Universal Construction on Self-Timed Cellular Automata. 21-30 http://dx.doi.org/10.1007/978-3-540-30479-1_3 2004 conf/acri/2004 ACRI db/conf/acri/acri2004.html#TakadaIPM04