1. Plant invasions, interspecific hybridization and the evolution of new plant taxa
2. Armstrong DL (1957) Cytogenetic study of some derivatives of the F1hybrid Prunus amygdalus × P. persica. PhD thesis,University of California, Davis.
3. Bailey CH, Hough LF (1975) Apricots.In:Janick J, Moore JN (eds) Advances in Fruit Breeding. Purdue University Press, West Lafayette, Indiana, pp367-384.