1. Some relational cell models: The metabolic-repair system;Rosen,1972
2. Organisms as casual systems which are not mechanisms: An essay into the nature of complexity;Rosen,1985
3. The theory of metabolic-repair systems;Casti;Appl. Math. Comput.,1988
4. Newton, Aristotle and the modeling of living systems;Casti,1989
5. A calculus for self-reference;Varela;Internat. J. Gen. Systems,1975