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    Kumar, S., Bajpai, V., Singh, A., & Kumar, B. (2018). identification, characterization and distribution of terpene indole alkaloids in ethanolic extracts of Catharanthus roseus using high‐performance liquid chromatography/electrospray ionization quadrupole time‐of‐flight tandem mass spectrometry and the study of their geographical variation. Rapid communications in mass spectrometry, 32, 319–332. http://access.bl.uk/ark:/81055/vdc_100056441176.0x000031