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James H. Tsai, Joan L. Perrier, Morphology of the Digestive and Reproductive Systems of Dalbulus maidis and Graminella nigrifrons (Homoptera: Cicadellidae), The Florida Entomologist, Vol. 79, No. 4 (Dec., 1996), pp. 563-578
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Tsai et al. (1996) studied this question.
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