1. Ahlquist P, French R, Janda M, Loesch-Fries SL (1984) Proc. Natl. Acad. Sci. (USA) 81:7066?7070.
2. Armstrong CL, Green CE (1985) Planta 164:207?214.
3. Conger, BV, Hanning GE, Gray DJ, McDaniel JK (1983) Science 221:850?851.
4. Evans DA, Sharp WR (1986) In: Evans DA, Sharp WR, Ammirato PV (eds) Handbook of plant cell culture, vol 4, Techniques and Applications, Macmillan Publishing Co., New York, pp 97?132.
5. Göbel E, Brown PTH, Lörz H (1986) In: Nuclear techniques and in vitro culture for plant improvement. Intern. Atomic Energy Agency, Vienna, pp 21?28.