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Sakai, T.; Maarse, H.; Kepner, R.E.; Jennings, W.G.; Longhurst, W.M., Volatile components of Douglas fir needles, J. Agric. Food Chem., 1967, 15, 6, 1070-1072, https://doi.org/10.1021/jf60154a027 . [all data]