C. Guerrero, V. . Santibañez, Y. Araiza-Olvera, E. Ibarra-Figueroa, and B. Pérez-Pérez, “Control of velocity of DC motors by classical and passivity methods measuring only position: Theory and experimental comparison”, IEEE LAT AM T, vol. 18, no. 5, pp. 962–970, Apr. 2020.