• Pilot study for estimating physical fatigue based on heart rate variability and reaction timeAllik, Ardo; Pilt, Kristjan; Viigimäe, Moonika; Fridolin, IvoXV Mediterranean Conference on Medical and Biological Engineering and Computing -MEDICON 2019 : proceedings of MEDICON 2019, September 26–28, 2019, Coimbra, Portugal2020 / p. 193-200 https://doi.org/10.1007/978-3-030-31635-8_23 https://www.scopus.com/sourceid/19400157277 https://www.scopus.com/record/display.uri?eid=2-s2.0-85075855726&origin=inward&txGid=bcdf789b80cbc6fc625bc78376cfee10 https://www.webofscience.com/wos/woscc/full-record/WOS:000582693600023