de la Peña-Auerbach, L. and Garcia-Colon, L. (1967) “On the generalized Schröedinger equation”, Revista Mexicana de Física, 16(4), pp. 221–232. Available at: https://rmf.smf.mx/ojs/index.php/rmf/article/view/903 (Accessed: 6 July 2024).