1. Buiatti, M. (1988). Information flux and constraints in development and evolution, a critical review. In “Chaos and complexity”, (eds R. Livi, S. Ruffo, S. Ciliberto, M. Buiatti) World Scientific, Singapore: 331–345.
2. Buiatti, M., and Gimelli, F. (1993). Somaclonal variation in ornamentals. In: “Creating Variation in Ornamentals”. Eucarpia, San Remo, 1–5 March 1993 (ed. T. Schiva) pp. 5–24.
3. D’Amato, F and Hoffman Ostenhof, O. (1956). Metabolism and spontaneous mutations in plants. Advances in Genetics 8: 1–26.
4. Durrant, A. and Jones, T.W.A. (1971). Reversion of induced changes in amount of nuclear DNA in Linum. Heredity, 27: 431–439.
5. Meins, F. (1983). Heritable variation in plant cell culture. Annual Review of Plant Physiology 34: 327–346.