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• Stratigraafiast siis ja praeguHints, OlleGeoloogia siis ja praegu : [20. geoloogia sügiskooli artiklid ja ettekanded]2024 / lk. 27–32 https://sisu.ut.ee/wp-content/uploads/sites/447/Geoloogia-siis-ja-praegu.-Schola-Geologica-XX.pdf
• The Pirgu Regional Stage (Upper Ordovician) in the East Baltic : lithostratigraphy, biozonation, and correlationHints, Linda; Oraspõld, Asta; Nõlvak, JaakProceedings of the Estonian Academy of Sciences. Geology2005 / 4, p. 225-259 : ill