Nestor, V., Einasto, R., Loydell, D. K. 2002.
Chitinozoan biostratigraphy and lithological characteristics of the Lower and Upper Visby boundary beds in the Ireviken 3 section, Northwest Gotland.Proceedings of the Estonian Academy of Sciences. Geology51,
Nestor, V. 1999.
Distribution of chitinozoans in the Llandovery of the Oslo region.Bollettino della Società Paleontologica Italiana38,