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Chitwood, B.G., Wehr, E.E. The value of cephalic structures as characters in nematode classification, with special reference to the superfamily spiruroidea. Z. F. Parasitenkunde 7, 273–335 (1934). https://doi.org/10.1007/BF02125704
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DOI: https://doi.org/10.1007/BF02125704