1. Ivanov, A. V. & Yu. V. Mamkaev, 1973. Resnischnyye chervi (Turbellaria), ikh proiskhozhdenie i evolutsiya. Filogeneticheskie ocherki. Nauka, Leningrad, 221 pp. (Turbellaria, their origin and evolution. Phylogenetic essays. In Russian.)
2. Kotikova, E. A., 1979. Osobennosti evolyutsii nervnogo apparata tsestod. Tr. Zool. Inst. Akad. Nauk USSR 84: 34?38. (On peculiarities of the evolution of the nerve apparatus in Cestodes. In Russian, English res.)
3. Kotikova, E. A., 1985. Comparative characterization of the nervous system of the Turbellaria. This volume.
4. Mamkaev, Yu. V., 1966. Morfologicheskoye mnogoobraziye kak pokazatyel primitivnosti gruppy. In E. A. Frolova (ed.), Nauchnaya konferentsiya, posvyashchennaya 100-letiyu so dnya rozhdeniya akademika A. N. Severtsova, Moskva, 22?24 dekabrya 1966 g., Tezisy dokladov. Nauka, Moskva: 18?20. (The morphological diversity as a primitive-group criterion. In Russian.)
5. Mamkaev, Yu. V., 1967. Ocherki po morfologii beskishechnykh turbellarij. Tr. Zool. Inst. Akad. Nauk USSR 44: 26?108. (Essays on the morphology of acoelous turbellarians. In Russian.)