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Chistikov S.D. (1979). Phylogenetic relations of the Scaphopoda. LIKHAREV I. M. (ed.), Molliuski, osnovnye rezul'taty ikh izucheniia [= Molluscs, Main Results of their Study]. Vsesojuznoe soveskhdunie po izucheniju molljuskov, 6. Leningrad: Nauka, 20-22. [In Russian].