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Thappa, R.K.; Bakshi, S.K.; Dhar, L.; Agarwal, S.G.; Kitchlu, S.; Kaul, M.K.; Suri, K.A., Significance of changed climatic factors on essential oil composition of Echinacea purpurea under subtropical conditions, Flavour Fragr. J., 2004, 19, 5, 452-454, https://doi.org/10.1002/ffj.1352 . [all data]