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Smirnov, A.V. (1998). On the classification of the apodid holothurians. In: R. Mooi, M. Telford, eds. Echinoderms: San Francisco. Proceedings of the ninth international echinoderm conference. San Francisco/California/USA/5–9 August 1996. Rotterdam: A.A. Balkema. xxxii + 923 pp. pp. 517-522.