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Kostenko, A. G.; Mamkaev, Yu. V. (1990). The position of "green convoluts" in the system of acoel turbellarians (Turbellaria, Acoela). 1. Simsagittifera gen. n. 2. Sagittiferidae fam. n. Zool. Zh. 69(6):11-21 ; 69(7):5-16.