Szumilas, M. and Wielemborek, M. 2024. Echo State Network-Based Estimation of Photoplethysmography Sensor-To-Skin Contact Force. Acta Physica Polonica A ISSN 1898-794X . 146, 4 (Nov. 2024), 369. DOI:https://doi.org/10.12693/APhysPolA.146.369.