Gómez-Aguilar, J., J. Rosales-García, J. Bernal-Alvarado, T. Córdova-Fraga, and R. Guzmán-Cabrera. “Fractional Mechanical Oscillators”. Revista Mexicana De Física, vol. 58, no. 4, Jan. 2012, pp. 348-52, https://rmf.smf.mx/ojs/index.php/rmf/article/view/3934.