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Ray, T. S. 1991b. Evolution and optimization of digital organisms. In: Billingsley K. R., E. Derohanes, H. Brown, III [eds.], Scientific Excellence in Supercomputing: The IBM 1990 Contest Prize Papers, Athens, GA, 30602: The Baldwin Press, The University of Georgia, Pp. 489-531.
Ray, T. S. 1994a. An evolutionary approach to synthetic biology: Zen and the art of creating life. Artificial Life 1(1/2): 195-226
Ray, T. S. 1994b. A proposal to consolidate and stabilize the rain forest reserves of the Sarapiquí region of Costa Rica. Available by anonymous ftp: tierra.slhs.udel.edu [220.127.116.11] and life.slhs.udel.edu [18.104.22.168] as tierra/doc/reserves.tex.
Ray, T. S. 1994c. Evolution, complexity, entropy, and artificial reality. Physica D 75: 239-263.