Application of carbon isotopes to the study of the Ordovician and Silurian of the BalticMartma, Tõnu2006 https://digi.lib.ttu.ee/i/?107 https://www.ester.ee/record=b2209327*est Automatic fed-batch cultivation for economic in vivo isotopic labelingVanatalu, Kalju; Tsanev, RobertJournal of biotechnology2008 / Suppl. 1, p. S512-S513 https://ru.article.sk/book/24372689/ef131e/automatic-fedbatch-cultivation-for-economic-in-vivo-isotopic-labeling.html Eesti vete isotoopkoostisVaikmäe, ReinEesti Geograafia Seltsi aastaraamat = Yearbook of the Estonian Geographical Society. 47. kd2024 / lk. 36-46 https://www.ester.ee/record=b1237665*est https://www.ester.ee/record=b4668698*est Isotoop-paleoklimatoloogia ja -hüdroloogiaVaikmäe, ReinGeoloogia instituudi kuuskümmend viis aastat : loomine ja muutumised, inimesed ja teadus, meenutused ja suundumused2012 / lk. 138-143 : fot Searching for the Ordovician-Silurian boundary in Estonia, Latvia and LithuaniaMeidla, Tõnu; Hints, Olle; Ainsaar, LehoEstonian journal of earth sciences2023 / p. 70-73 : ill https://doi.org/10.3176/earth.2023.53 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS Surface mass balance and stable oxygen isotope ratios from shallow firn cores on Fimbulisen, East AntarcticaSchlosser, Elisabeth; Martma, TõnuAnnals of glaciology2012 / p. 70-78 : ill https://kirjandus.geoloogia.info/en/reference/24196 Variations in carbon isotope composition of microfossils and bulk organic matter from the Middle Ordovician through Wenlock (Silurian) in EstoniaHints, Olle; Kaljo, Dimitri; Kaptein, Helja; Martma, Tõnu; Munnecke, Axel10th Baltic Stratigraphic Conference : Checiny, 12-14 September 2017 : abstracts and field guide2017 / p. 36-37 http://geo.uw.edu.pl/tl_files/publikacje/10th_Baltic_Stratigraphic_Conference_Abstracts_and_Field_Guide.pdf