1. Zenk, M. H. (1978), inFrontiers of Plant Tissue Culture 1978, Thorpe, T. A., ed., International Association for Plant Tissue Culture, pp. 1–13.
2. Kurz, W. G. W., and Constabel, F. (1979),Adv. Appl. Microbiol. 25, 209.
3. Dougall, D. K. (1979),Cell Substrates, 135.
4. Staba, E. J. (1980) inPlant Tissue Culture as A Source of Biochemicals, Staba, E. J., ed., CRC Press, Florida, 59–97.
5. Nickell, L. G. (1980), ibid., 235–269.