Jik H. Chang Oscar H. Ibarra Michael A. Palis Efficient Simulations of Simple Models of Parallel Computation by Time-Bounded ATM's and Space-Bounded TM's. 119-132 1988 conf/icalp/1988 ICALP db/conf/icalp/icalp88.html#ChangIP88 http://dx.doi.org/10.1007/3-540-19488-6_111