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Weidenhamer, J.D.; Jordan, E.D.; Fischer, N.H., Evaluation of high-performance liquid and capillary gas chromatography for analysis of sesquiterpene lactones of the Melampodiinae, J. Chromatogr., 1990, 504, 151-161, https://doi.org/10.1016/S0021-9673(01)89521-2 . [all data]