Peñafiel-Arteaga, Nataly, and Marlon Navia. “Systematic Literature Review on Energy Harvesting Mechanisms Used in Vital Signs Monitoring”. Revista Tecnológica - ESPOL 37, no. 1 (June 30, 2025): 247–263. Accessed October 17, 2025. https://www.rte.espol.edu.ec/index.php/tecnologica/article/view/1224.