Ken S. Stevens Ran Ginosar Shai Rotem Relative timing [asynchronous design]. 129-140 2003 11 IEEE Trans. VLSI Syst. 1 http://doi.ieeecomputersociety.org/10.1109/TVLSI.2002.801606 db/journals/tvlsi/tvlsi11.html#StevensGR03