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David C. Culver, John R. Holsinger, Preliminary Observations on Sex Ratios in the Subterranean Amphipod Genus Stygonectes (Gammaridae), The American Midland Naturalist, Vol. 82, No. 2 (Oct., 1969), pp. 631-633
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Culver et al. (1969) studied this question.
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