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Filipjev, I. N. (1934). The classification of the free-living nematodes and their relation to the parasitic nematodes. Smithsonian Miscellaneous Collection. 89: 1-63.
Filipjev, I. N. (1934). The classification of the free-living nematodes and their relation to the parasitic nematodes. Smithsonian Miscellaneous Collection. 89: 1-63.