Rozo Clavijo, M. 2018. Analysis of a problem of coupled oscillators making use of the bra-ket notation used in quantum mechanics. Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales. 42, 163 (Jun. 2018), 166–171. DOI:https://doi.org/10.18257/raccefyn.515.