Literaturrecherche

Literatur Frese L (1989) Regeneration: a survey on current state of collections (Report). Rome: IBPGR, 49-55 p, Int Crop Network Ser 3

Literatur Letschert JPW, Lange W, Frese L, Berg RG van den (1989) Taxonomy of Beta section Beta Report : International Workshop on Beta Genetic Resources. Int Crop Network Ser 3:64-70

Literatur Frese L, Hintum TJL van (1989) The International Data Base for Beta : Appendix 3. Int Crop Network Ser 3:17-45