Ainsaar, L., Kaljo, D., Martma, T., Meidla, T., Männik, P., Nõlvak, J. & Tinn, O. 2010. Middle and Upper Ordovician carbon isotope chemostratigraphy in Baltoscandia: a correlation standard and clues to environmental history. Palaeogeography, Palaeoclimatology, Palaeoecology, 294, 189−201.
https://doi.org/10.1016/j.palaeo.2010.01.003

Brenchley, P. J., Carden, G. A., Hints, L., Kaljo, D., Marshall, J. D., Martma, T., Meidla, T. & Nõlvak, J. 2003. High-resolution stable isotope stratigraphy of Upper Ordovician sequences: constraints on the timing of bioevents and environmental changes associated with mass extinction and glaciation. Geological Society of America Bulletin, 115, 89−104.
https://doi.org/10.1130/0016-7606(2003)115<0089:HRSISO>2.0.CO;2

Hints, L., Hints, O., Kaljo, D., Kiipli, T., Männik, P., Nõlvak, J. & Pärnaste, H. 2010. Hirnantian (latest Ordovician) bio- and chemostratigraphy of the Stirnas-18 core, western Latvia. Estonian Journal of Earth Sciences, 59, 1−24.
https://doi.org/10.3176/earth.2010.1.01

Kaljo, D. 1956. Genera Primitophyllum gen. nov. and Leolasma gen. nov. In Materialy po paleontologii. Novye semejstva i rody [Materials on palaeontology. New families and genera], pp. 35–37. VSEGEI, Moscow [in Russian].

Kaljo, D. 1958. On the taxonomy of the genus Streptelasma Hall and a description of some new rugose corals. ENSV Teaduste Akadeemia Geoloogia Instituudi Uurimised, 2, 19–26 [in Russian].

Kaljo, D. (ed.). 1970. Silurian of Estonia. Valgus Publishers, Tallinn, 343 pp. [in Russian].

Kaljo, D. 2004. Diversity of late Ordovician rugose corals in Baltoscandia: role of environmental changes and com­parison with other areas. Proceedings of the Estonian Academy of Sciences, Geology, 53, 233–245.

Kaljo, D. & Martma, T. 2006. Application of carbon isotope strati­graphy to dating the Baltic Silurian rocks. GFF, 128, 123−129.
https://doi.org/10.1080/11035890601282123

Kaljo, D., Kiipli, T. & Martma, T. 1994. Geochemical and isotope (d¹³C) event markers through the Wenlock–Pridoli sequence in Ohesaare (Estonia). Erlanger Geologische Abhandlungen, 122, p. 36.

Kaljo, D., Kiipli, T. & Martma, T. 1997. Carbon isotope event markers through the Wenlock–Pridoli sequence at Ohesaare (Estonia) and Priekule (Latvia). Palaeo­geography, Palaeoclimatology, Palaeoecology, 132, 211–223.
https://doi.org/10.1016/S0031-0182(97)00065-5

Kaljo, D., Hints, L., Martma, T., Nõlvak, J. & Oraspõld, A. 2004. Late Ordovician carbon isotope trend in Estonia, its significance in stratigraphy and environmental analysis. Palaeogeography, Palaeoclimatology, Palaeoecology, 210, 165−185.
https://doi.org/10.1016/j.palaeo.2004.02.044

Kaljo, D., Hints, L., Männik, P. & Nõlvak, J. 2008. The succession of Hirnantian events based on data from Baltica: brachiopods, chitinozoans, conodonts, and carbon isotopes. Estonian Journal of Earth Sciences, 57, 197−218.
https://doi.org/10.3176/earth.2008.4.01

Kaljo, D., Martma, T., Grytsenko, V., Brazauskas, A. & Kaminskas, D. 2012a. Přídolí carbon isotope trend and upper Silurian to lowermost Devonian chemo­stratigraphy based on sections in Podolia (Ukraine) and the East Baltic area. Estonian Journal of Earth Sciences, 61, 162−180.
https://doi.org/10.3176/earth.2012.3.03

Kaljo, D., Männik, P., Martma, T. & Nõlvak, J. 2012b. More about the Ordovician−Silurian transition beds at Mirny Creek, Omulev Mountains, NE Russia: carbon isotopes and conodonts. Estonian Journal of Earth Sciences, 61, 277–294.
https://doi.org/10.3176/earth.2012.4.07

Kaljo, D., Hints, L., Martma, T. & Nõlvak, J. 2017. A multiproxy study of the Puhmu core section (Estonia, Upper Ordovician): consequences for stratigraphy and environmental interpretation. Estonian Journal of Earth Sciences, 66, 77–92.
https://doi.org/10.3176/earth.2017.08