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Witte, L.; Rubiolo, P.; Bicchi, C.; Hartmann, T., Comparative analysis of pyrrolizidine alkaloids from natural sources by gas chromatography-mass spectrometry, Phytochemistry, 1992, 32, 1, 187-196, https://doi.org/10.1016/0031-9422(92)80130-7 . [all data]

Jenett-Siems, K.; Schimming, T.; Kaloga, M.; Eich, E.; Siems, K.; Gupta, M.P.; Witte, L.; Hartmann, T., Pyrrolizidine alkaloids of Ipomoea hederifolia and related species, Phytochemistry, 1998, 47, 8, 1551-1560, https://doi.org/10.1016/S0031-9422(97)01082-0 . [all data]

Justus, M.; Witte, L.; Hartmann, T., Levels and tissue distribution of loline alkaloids in endophyte-infected Festuca pratensis, Phytochemistry, 1997, 44, 1, 51-57, https://doi.org/10.1016/S0031-9422(96)00535-3 . [all data]

Tofern, B.; Kaloga, M.; Witte, L.; Hartmann, T.; Eich, E., Occurrence of loline alkaloids in Argyreia mollis (Convolvulaceae), Phytochemistry, 1999, 51, 8, 1177-1180, https://doi.org/10.1016/S0031-9422(99)00121-1 . [all data]

Wink, M.; Witte, L.; Hartmann, T.; Theuring, C.; Volz. V., Accumulation of quinolizidine alkaloids in plants and cell suspension cultures: genera lupinus, cytisus, baptisia, genista, laburnum, and sophora, Planta Medica, 1983, 48, 4, 253-257, https://doi.org/10.1055/s-2007-969928 . [all data]

Jenett-Siems, K.; Ott, S.C.; Schimming, T.; Siems, K.; Müller, F.; Hilker, M.; Witte, L.; Hartmann, T.; Austin, D.F.; Eich, E., Ipangulines and minalobines, chemotaxonomic markers of the infrageneric Ipomoea taxon subgenus Quamoclit, section Mina, Phytochemistry, 2005, 66, 2, 223-231, https://doi.org/10.1016/j.phytochem.2004.11.019 . [all data]

Weber, S.; Eisenreich, W.; Bacher, A.; Hartmann, T., Pyrrolizidine alkaloids of the lycopsamine type: biosynthesis of thracelanthic acid, Phytochemistry, 1999, 50, 6, 1005-1014, https://doi.org/10.1016/S0031-9422(98)00203-9 . [all data]

Frolich, C.; Ober, D.; Hartmann, T., Tissue distribution, core biosynthesis and diversification of pyrrolizidine alkaloids of the lycopsamine type in three Boraginaceae species, Phytochemistry, 2007, 68, 7, 1026-1037, https://doi.org/10.1016/j.phytochem.2007.01.002 . [all data]

Gómez, N.E.; Witte, L.; Hartmann, T., Chemical defense in larval tortoise beetles: essential oil composition of fecal shields of Eurypedus nigrosignata and foliage of its host plant, Cordia curassavica, J. Chem. Ecol., 1999, 25, 5, 1007-1027, https://doi.org/10.1023/A:1020821507014 . [all data]

Hartmann, T.G., Development of a new ptx device for the measurement of vapor-liquid equilibrium, M.Sc. Thesis, Washington Univ., St. Louis, MO, 1972. [all data]