1. Bornman, C.H., and Jansson, E., 1981, Regeneration of plants from the conifer leaf, Colloque sur la culture in vitro des essences forestieres, AFOCEL, Nangis, France, p. 41–55.
2. Gebhardt, K., Weisgerber, H., and Fröhlich, H. I., 1988, In vitro germination and production of embryogenic callus from liquid suspension cultures of Abies alba — silver fir, Poster Abstract, 4th Int. Conifer Tissue Culture Work Group, Saskatoon.
3. Gresshof, P.M., and Doy, C.H., 1972, Development and differentiation of haploid Lycopersicon esculentum (tomato), Planta, 17:161–170.
4. Kerns, H. R., and Meyer, M. M. Jr., 1986, Tissue culture propagation of Acer x freemanii using thidiazuron to stimulate shoot tip proliferation, HortScience, 21:1209–1210.
5. Schuller A., Reuther, G., and Geier, Th., 1989, Somatic embryogenesis from seed expiants of Abies alba, Plant Cell, Tissue and Organ Culture, 17:53–58.