Otter, Margareete2018-12-092018-12-0920001022-8012http://hdl.handle.net/123456789/313enAttribution-NonCommercial 4.0 Internationalhttp://creativecommons.org/licenses/by-nc/4.0/Nikolai Pärna, chronobiologyNikolajs Pērna, hronobioloģijaThe Founder of Chronobiology – Nikolai PärnaArticle10.25143/amhr.2000.V.15