1. Feldman, M. 1965. Further evidence for natural hybridization between tetraploid species of Ægilops section Pleionathera. Evolution, 19, 162–174.
2. Harlan, J R. 1965. The possible role of weed races in the evolution of cultivated plants. Euphytica, 14, 173–176.
3. Kihara, H. 1954. Considerations on the evolution and distribution of Ægilops species based on the analyzer-method. Cytologia, 19, 336–357.
4. Pazy, B, and Zohary, D. 1965. The process of introgression between Ægilops polyploids: Natural hybridization between A. variabilis, A. ovata and A. biuncialis. Evolution, 19, 385–394.
5. Sears, E R. 1959. Weizen I: The systematics, cytology and genetics of wheats. In Handbuch der Pflanzenzuechtung ed. H. Kappert, and W. Rudorf, Vol. II, 164–187. Parey, Berlin.