| Ecological system. (E, p. 20) |
| Solar system as a dynamic system. (E, p. 17) |
| Isomorphic systems. (C, p. 455) |
| Mathematical formulation for growth in a system. (C, pp. 454-455) |
| Quantified structure in a matrix. (2, pp. 164-165) |
| Prisoner's dilemma. (4, p. 290) |