1. Hybrid origin of the Oxford Ragwort, Senecio squalidus L;Abbott;Watsonia,2000
2. The genetic basis of floral variation in Senecio jacobaea (Asteraceae);Andersson;Journal of Heredity,2001
3. Analysis of hybrid zones;Barton;Annual Review of Ecology, Evolution, and Systematics,1985
4. Senecio×Saundersii Sauer and Beck (Asteraceae), an intermediate hybrid between S. keniodendron and S. keniensis of Mt Kenya;Beck;Phyton-Annales Rei Botanicae,1992