1. Avnir, D., Kagan, M., Levi, A.: Naturwissenschaften 70, 144 (1983)
2. Kagan, M., Levi, A., Avnir, D.: ibid. 69, 548 (1982)
3. Möckel, P.: ibid. 64, 224 (1977)
4. A similar conclusion was reached by J.C. Micheau (private communication) for the photochemical case, after finding additional systems to those reported by us.
5. We are aware only of Orban's speculation [J. Am. Chem. Soc. 102, 4311 (1980)] regarding the role of oxygen diffusion in the formation of the stationary spatial structures in the Belousov-Zhabotinskii reaction.