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J. P. André, M. Delverdier, P. Cabanié, G. Bartel, Malignant Melanoma in an African Grey Parrot (Psittacus erithacus erithacus), Journal of the Association of Avian Veterinarians, Vol. 7, No. 2 (1993), pp. 83-85
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André et al. (1993) studied this question.
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