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Smirnov, A. V. (1989). Coordination of the system of recent and extinct holothurian of the family Synaptidae. Pp 203-217. In: PROBLEMY IZUCHENIYA ISKOPAEMYKH I SOVREMENNYKH IGLOKOZHIKH [Fossil and recent echinoderm researches]. (Kalo, DD., Rozhnov, SV., Solovev, AN., Stukalina, GA., & Khints, LM., eds.). Acad. Sci. Estonia, Inst. Geol.; Tallinn. Pp 203-217.