1. Ando, H., Sawada, Y., Shimizu, H., & Sugiyama, T. 1989. Pattern formation in Hydra tissue without developmental gradients. Dev. Biol., 133, 405–414.
2. Berking, S. 1979. Analysis of head and foot formation in Hydra by means of an endogenous inhibitor. W. Roux Arch. Dev. Biol., 186, 189–210.
3. Bode, M. P., & Bode, H. R. 1984. Patterning in Hydra. In Pattern formation, Malacinski, G. M. (ed). New York: Macmillan Publishing Co.
4. Fraser, S. E., Green, C. R., Bode, H. R., & Gilula, N. B. 1987. Selective disruption of gap junctional communication interferes with patterning process in Hydra. Science, 273, 35–49.
5. Gierer, A. 1977. Biological features and physical concepts of pattern formation by Hydra. In Current Topics in Dev. Biol., Moscona, A. Monroy A. A. (ed). pp. 17–58, New York: Academic Press.