FU, Qiang. Research of Multifunctional Fitness Equipment Monitor Based on Photoelectric Sensor. International Journal of Online and Biomedical Engineering (iJOE), [S. l.], v. 12, n. 02, p. pp. 42–45, 2016. DOI: 10.3991/ijoe.v12i02.5045. Disponível em: https://online-journals.org/index.php/i-joe/article/view/5045. Acesso em: 29 mar. 2024.