Composition #1: Posthumus, M.A., van Beek, T.A., Collins, N.F., Graven, E.H. Chemical composition of the essential oils of agathosma betulina, A. Crenulata and an A. Betulina x crenulata Hybrid (buchu). journal of essential oil research, 1996, vol. 8, no. 3, p. 223–228. DOI: 10.1080/10412905.1996.9700606.
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