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Klussmann-Kolb, A.; Dinapoli, A. (2006). "Systematic position of the pelagic Thecosomata and Gymnosomata within Opisthobranchia (Mollusca, Gastropoda) - revival of the Pteropoda". Journal of Zoological Systematics and Evolutionary Research. 44 (2): 118. doi:10.1111/j.1439-0469.2006.00351.x.