1. Self-reproduction in small cellular automata;Byl;Physica D,1989
2. Problem solving during artificial selection of self-replicating loops;Chou;Physica D,1998
3. K.E. Drexler, Nanosystems: Molecular Machinery, Manufacturing, and Computation, Wiley, New York, 1992.
4. R.A. Freitas Jr., R.C. Merkle, Kinematic Self-replicating Machines, Landes Bioscience, Georgetown, TX, in press.
5. Self-reproduction in three-dimensional reversible cellular space;Imai;Artif. Life,2002