Chitinozoan biostratigraphy of the Upper Ordovician D. clingani and P. linearis graptolite biozones on the Island of Bornholm, DenmarkVandenbroucke, Thijs R. A.; Recourt, Philippe; Nõlvak, Jaak; Nielsen, Arne T.Stratigraphy2013 / p. 281-301 : ill

A CONOP9 quantitative stratigraphic model of Baltic Ordovician and Silurian chitinozoan distribution and K-bentonitesAntonovitš, Liina; Nestor, Viiu-Kai; Nõlvak, Jaak; Bauert, Garmen; Hints, Olle; Kiipli, TarmoStratigraphy2015 / p. 91-92