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Grayer, R J and Kimmins, F M and Padgham, D E and Harborne, J B and Ranga Rao, D V (1992) Condensed tannin levels and resistance of groundnuts (Arachis hypogaea) against Aphis craccivora. Phytochemistry, 31 (11). pp. 3795-3800. ISSN 0031-9422