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Boon, J. J., Nip, M., Eijkel, G., Brandt-de Boer, B., & van Amsterdam, M. (1989). Characterisation of citrus and apple pectins by pyrolysis mass spectrometry in PY-EI-MS, DCIMS and PYGCMS Modes. In P. Longevialle (Ed.), Proceedings of the 11th International Mass Spectrometry Conference held at Bordeaux, 29 August-2 September 1988 (pp. 1100–1101).