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3. K. Kawazu, in “Studies on the Natural Character of Suburban Forests and Their Function of Protecting the Environment (VI)” (in Japanese), Reports of Specific Research at Okayama University in 1991, 1992, pp. 67–72.
4. H. Standermann, H. Dieperger, and D. Scheel, in “Plant Tissue Culture and its Biotechnological Application,” ed. by W. Barz, E. Reinhard, and M. H. Zenk, Springer-Verlag, Berlin, 1977, pp. 177–196.