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2. Fragrance Chemistry, p. 123.
3. Encyclopedia of the Terpenoids, Vol. I and II. Wiley, Chichester (1982).
4. and , in Progress in Phytochemistry, and , eds., Vol. 5, p. 181. Pergamon Press, Oxford (1978).
5. in New Manual of Bryology, ed., Vol. 1, p. 1, Hattori Bot. Laboratory, Nichinan-shi (Jap.) (1983).