Sáez, Y., H. Montes, A. Garcia, J. Muñoz, E. Collado, and R. Mendoza. “Indoor Navigation Technologies Based on RFID Systems to Assist Visually Impaired People: A Review and a Proposal”. IEEE Latin America Transactions, vol. 19, no. 8, Mar. 2021, pp. 1286-98, https://latamt.ieeer9.org/index.php/transactions/article/view/4454.