Bonatsos, D., Daskaloyannis, C., Kolokotronis, P. and Lenis, D. 2020. Symmetry algebra of the planar anisotropic quantum harmonic oscillator with rational ratio of frequencies. HNPS Advances in Nuclear Physics. 4, (Feb. 2020), 153–162. DOI:https://doi.org/10.12681/hnps.2881.