Akopyan T. S. Tigran Stepanovich, Lechtenfeld O. Olaf, Nersessian A. P. Armen Petrosovich, Saghatelian A, & Yeghikyan V. (2012). Integrable generalizations of oscillator and Coulomb systems via action–angle variables; Physics Letters A; Vol. 376, iss. 5. 2012. https://doi.org/10.1016/j.physleta.2011.12.034
Chicago-viite (17. p.)Akopyan T. S. Tigran Stepanovich, Lechtenfeld O. Olaf, Nersessian A. P. Armen Petrosovich, Saghatelian A, ja Yeghikyan V. Integrable Generalizations of Oscillator and Coulomb Systems via Action–angle Variables; Physics Letters A; Vol. 376, Iss. 5. 2012, 2012. https://doi.org/10.1016/j.physleta.2011.12.034.
MLA-viite (9. p.)Akopyan T. S. Tigran Stepanovich, et al. Integrable Generalizations of Oscillator and Coulomb Systems via Action–angle Variables; Physics Letters A; Vol. 376, Iss. 5. 2012, 2012. https://doi.org/10.1016/j.physleta.2011.12.034.