1. Abbott AJ 1977 Propagating temperate woody species in tissue culture. Sci Hort 28: 155–162
2. Abbott AJ 1978 Practice and promise of micropropagation of woody species. Acta Horticulturae 79: 113–127
3. Ahuja, MR and Muhs HJ 1985 In vitro techniques in clonal propagation of forest tree species. In: Schafer-Menuhr A, ed. In Vitro Techniques Propagation and Long Term Storage. Boston: Martinus Nijhoff/Dr. W. Junk Publishers
4. Ammirato PV 1983 Embryogenesis. In: Evans DA, Sharp WR, Ammirato PVA, and Yamada Y, eds. Handbook of Plant Cell Culture. Vol. I. Techniques for Propagation and Breeding, pp 82–123. New York: Macmillan Publishing Co.
5. Bayliss MW 1973 Origin of chromosome number variation in cultured plant cells. Nature 246: 529–530