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Rischer, M. and Adamczyk, M. and Ratz, H. and Hose, S. and Marchesan, M. and Paper, D. H. and Franz, Gerhard and Wolf-Heuss, E. and Engel, J. (1998) Quantitative Determination of the Iridoid Glycosides Aucubin and Catalpol in Plantago lanceolata L. Extracts by HPTLC and HPLC. Journal of planar chromatography modern TLC : J Plan Chrom 11, pp. 374-378.