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Robert H. Gibbs, Jr., Barbara A. Hurwitz, Systematics and Zoogeography of the Stomiatoid Fishes, Chauliodus pammelas and C. sloani, of the Indian Ocean, Copeia, Vol. 1967, No. 4 (Dec. 8, 1967), pp. 798-805
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Gibbs et al. (1967) studied this question.
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