References:
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Korkutis, V. A. 1966. Tubicolous Worms of the Lower Cambrian of the South of the East Baltic territory. Palaeontology and stratigraphy of the Baltic and the Byelorussia. Number I (VI), pp. 7-29.
Małgorzata Moczydłowska, Frances Westall, Frédéric Foucher (2014). Microstructure and Biogeochemistry of the Organically Preserved Ediacaran Metazoan Sabellidites. J. of Paleontology, 88(2):224-239 (2014).