1. Ehrendorfer, F.: Cytologie, Taxonomie und Evolution bei Samenpflanzen. Vistas in Botany4, 99?186 (1963).
2. - Dispersal mechanisms, genetic systems, and colonizing abilities in some flowering plant families. In: The genetics of colonizing species, p. 331 bis 352. New York 1965.
3. - Geographical and ecological aspects of infraspecific differentiation. In: V. H.Heywood (Ed.), Modern methods in plant taxonomy, p. 261?296. London 1968.
4. Ellenberg, H.: Vegetation Mitteleuropas mit den Alpen. Stuttgart 1963.
5. Grant, V.: The regulation of recombination in plants. Cold Spring Harbor Symp. Quant. Biol.23, 337?363 (1958).