1. Cameron JW, Frost HB (1968) Genetics, breeding, and nucellar embryony. In: Reuther W, Batchelor LD, Webber HJ (eds) The citrus industry, vol. II. University of California Press, Berkeley, Calif, pp 325–370
2. Frost HB, Soost RK (1968) Seed reproduction: development of gametes and embryos. In: Reuther W, Webber HJ, Batchelor LD (eds) The citrus industry, vol. II. University of California Press, Berkeley, Calif, pp 290–324
3. Grosser JW, Chandler JL (1987) Aseptic isolation of leaf protoplasts from Citrus, Ponicrus, Citrus x Ponicrus hybrids and Severinia for use in somatic hybridization experiments. Sci Hortic 31:253–257
4. Grosser JW, Gmitter FG, Jr. (1990) Protoplast fusion and citrus improvement. In: Janick J (ed) Plant breeding reviews, vol. 8. Timber Press, Portland pp 339–374
5. Gui YL, Gu SR, Xu TY (1982) Studies on morphological differentiation of endosperm plantlets of Chinese gooseberry in vitro (in Chinese with English summary). Acta Bot Sinica 24:216–221