1. Afanasjeva, G.A. and Viskova, L.A., Morphophysiological peculiarities of articulated brachiopods and marine bryozoans as a reason for their different evolutionary consequences of the Permian–Triassic crisis, Paleontol. J., 2021, vol. 56, no. 7, pp. 742–751.
2. Afanasjeva, G.A., Viskova, L.A., Morozova, I.P., and Nevesskaja, L.A., Consequences of the Permian crisis for various groups of invertebrates, in Ekosistemnye perestroyki i evolyutsiya biosfery. Vyp. 2 (Ecosystem Restructuring and Evolution of the Biosphere. Vol. 2), Moscow: Paleontol. Inst. Ross. Akad. Nauk, 1998, pp. 30–37.
3. Bassler, R.S., Treatise on Invertebrate Paleontology. Pt G. Bryozoa, Lawrence: Geol. Soc. Am.; Univ. Kansas Press, 1953.
4. Canu, F. and Bassler, R.S., Studies on the cyclostomatous Bryozoa, Proc. U.S. Natl. Mus. (Washington), 1922, vol. 61, Art. 22, pp. 1–154.
5. Canu, F. and Bassler, R.S., Studies on the cyclostomatous Bryozoa, Proc. U.S. Natl. Mus. (Washington), 1926, vol. 67, Art. 21, pp. 1–124.