1. Clapham, D.: In vitro development of callus from the pollen of Lolium and Hordeum. Z. Pflanzenzüchtg. 65, 285?292 (1971)
2. Clapham, D.: Haploid Hordeum plants from anthers in vitro. Z. Pflanzenzüchtg. 69, 142?155 (1973)
3. LaCour, L.F.: Nuclear differentiation in the pollen grain. Heredity 3, 319?337 (1949)
4. Linsmaier, E.M., Skoog, F.: Organic growth factor requirements of tobacco tissue cultures. Physiol. Plant. (Kbh.) 18, 100?127 (1965)
5. Nitsch, C., Norreel, B.: Factors favoring the formation of androgenetic embryos in anther culture. In: Genes enzymes and populations, p. 129?144. Ed.: Srb, A.M. New York: Plenum Publishing Corporation 1972