Nestor, V. 2005.
Chitinozoans of the Margachitina margaritana Biozone and the Llandovery-Wenlock boundary in West Estonian drill cores.Proceedings of the Estonian Academy of Sciences. Geology54,
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,