REFERENCES
- Simard , S. , Hachey , J. H. and Collin , G. J. 1988 . The variation of essential oil composition during the extraction process. The case of Thuja occidentalis and Abies balsamea (L.) Mill . J. Wood Chem. Technol. , 8 : 561 – 573 .
- Lawrence , B. M. 1988 . Progress in essential oils . Perf. & Flav. , 13 ( 6 ) : 64 – 65 .
- Hunt , R. S. and Von Rudloff , E. 1974 . Chemosystematic studies in the genus Abies. I. Leaf and twig oil analysis of alpine and balsam firs . Can. J. Bot. , 52 : 477
- Moore , P. R. and Hanover , J. W. 1987 . Variation in the yield of blue spruce monoterpenes associated with crown position and frequency of resin canals . For. Sci. , 333 : 1081 – 1088 .
- Adams , R. P. and Hagerman , A. 1976 . A comparison of the volatile oils from mature vs. young leaves of Juniperus scopulorum: Chemosystematic significance . Biochem. Syst. Ecol. , 4 : 75 – 79 .
- Brooks , J. E. , Borden , J. H. , Pierce , H. D. and Lister , G. R. 1987 . Foliar and cortical monoterpenes in Sitka spruce: Potential indicators of resistance to the white pine Weevil, pissodes strobi peck (Coleoptera: Curculionidae) . Can. J. For. Res. , 17 : 740 – 745 .
- Von Rudloff , E. 1972 . Seasonal variation in the composition of the volatile oil of the leaves, buds, and twigs of white spruce (Picea glauca) . Can. J. Bot. , 50 : 1595 – 1603 .
- Von Rudloff , E. 1975 . Seasonal variation of the terpenes of the leaves, buds, and twigs of blue spruce (Picea pungens) . Can. J. Bot. , 53 : 2978 – 2982 .
- Kossuth , S. V. and Muse , H. D. 1986 . Cortical monoterpenes variation among slash pine ramets by season, aspect, crown position, and bud vigor . For. Sci. , 32 : 605 – 613 .
- Bernard-Dagan , C. 1987 . “ Biosynthesis of lower terpenoids: Genetic and physiological controls in woody plants ” . In Genetic Manipulation of Woody Plants , Edited by: Hanover , J. W. and Keathley , D. 329 – 351 . New York : Plenum Press .
- Heller , S. R. and Milne , G. W.A. 1978 . EPA/NIH Mass Spectra Data Base , Washington DC : U.S. Dept. of Commerce .
- Adams , R. P. 1989 . Identification of Essential Oils by Ion Trap Mass Spectroscopy , New York : Academic Press, Inc. .
- Kamdem , D. P. , Hanover , J. W. and Gage , D. 1993 . Contribution to the study of essential oils of Thuja occidentalis L . J. Essent. Oil Res. , in press