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O. M.  Amin and Dailey, M. D., ?Description of Mediorhynchus papillosus (Acanthocephala: Gigantorhynchidae) from a Colorado, U.S.A., population, with a discussion of morphology and geographical variability?, Journal of the Helminthological Society of WashingtonJ. Helminthol. Soc. Wash., vol. 65, no. 2, pp. 189 - 200, 1998.