Clarifying Haljala Stage in EstoniaPaiste, Tõnn; Meidla, Tõnu; Männik, Peep; Nõlvak, Jaak13th International Symposium on the Ordovician System, July 19-22, 20192019 / p. 149–150 http://www.igcp653.org/wp-content/uploads/2019/07/ISOS13Proceedings.pdf

New biostratigraphically important chitinozoans from the Kukruse Regional Stage, Upper Ordovician of BaltoscandiaNõlvak, Jaak; Bauert, GarmenEstonian journal of earth sciences2015 / p. 218-224 : ill https://artiklid.elnet.ee/record=b2739527*est

The boundary between the Haljala and Kukruse Regional Stages (Ordovician) in north-western EstoniaPaiste, Tõnn; Meidla, Tõnu; Männik, Peep10th Baltic Stratigraphic Conference : Checiny, 12-14 September 2017 : abstracts and field guide2017 / p. 65-66 : ill http://geo.uw.edu.pl/tl_files/publikacje/10th_Baltic_Stratigraphic_Conference_Abstracts_and_Field_Guide.pdf