Chitinozoans in the Wenlock-Ludlow boundary beds of the East BalticNestor, Viiu-KaiEstonian journal of earth sciences2007 / 2, p. 109-128 : ill https://artiklid.elnet.ee/record=b2380701*est

Chitinozoans of the Margachitina margaritana biozone and the Llandovery-Wenlock boundary in West Estonian drill coresNestor, Viiu-KaiProceedings of the Estonian Academy of Sciences. Geology2005 / 2, p. 87-111 : ill

Revision of Silurian vertebrate biozones and their correlation with the conodont successionMärss, Tiiu; Männik, PeepEstonian journal of earth sciences2013 / p. 181-204 : ill https://artiklid.elnet.ee/record=b2651564*est