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Machado, L.B.; Zoghbi, M.G.B.; Andrade, E.H.A., Seasonal variation in the composition of the essential oils rom the leaves, thin branches and resin of Protium spruceanum (Benth.) Engl., Flavour Fragr. J., 2003, 18, 4, 338-341, https://doi.org/10.1002/ffj.1238 . [all data]