@article{SIGMA_2015_11_a95,
     author = {Davit R. Petrosyan and George S. Pogosyan},
     title = {Harmonic {Oscillator} on the $\mathrm{SO}(2,2)$ {Hyperboloid}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2015},
     volume = {11},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2015_11_a95/}
}