Kalinkov, K., and V. Markova. “Preprocessing of PPG and EDA Signals for Detection of Emotional and Cognitive States via Physiological Signals”. ANNUAL JOURNAL OF TECHNICAL UNIVERSITY OF VARNA, BULGARIA, Vol. 6, no. 2, Nov. 2022, pp. 49-56, doi:10.29114/ajtuv.vol6.iss2.253. Accessed 7 Feb. 2023.