1. Pysek, P., Prach, K., Rejmanek, M. & Wade, M. Plant Invasions: General Aspects and Special Problems (SPB Academic, Amsterdam, 1995).
2. Huston, M. A. Biological Diversity. The Coexistence of Species on Changing Landscapes (Cambridge Univ. Press, Cambridge, 1994).
3. Ricklefs, R. E. & Schluter, D. Species Diversity in Ecological Communities (Univ. Chicago Press, Chicago, 1993).
4. Gaston, K. J. Rarity (Chapman & Hall, London, 1994).
5. Grace, J. B. & Tilman, D. Perspectives on Plant Competition (Academic, San Diego, 1990).