1. Calame , F.G. 2000 Ecological and genetic relationships between sexual and asexual Taraxacum section Ruderalia PhD-thesis.
2. Cytogeographical studies of Taraxacum sect. Taraxacum (=sect. Vulgaria) in Central Europe;Den Nijs;Bot. Jahrb. Syst.,1980
3. Cytogeography and ecology of diploids and triploids of Taraxacum section Taraxacum. South Limburg, The Netherlands;Elzinga;Proc. K. Ned. Akad. Wetenschap. C,1987
4. Effect of triploid fitness on the coexistence of diploids and tetraploids;Felber;Biol. J. Linnean Soc.,1997
5. Ecological constraints on the establishment of a novel polyploid in competition with its diploid ancestor;Fowler;Am. Nat.,1984