1. M. Cariglia, Hidden symmetries of dynamics in classical and quantum physics, Rev. Mod. Phys.86 (2014) 1283 [arXiv:1411.1262] [INSPIRE].
2. O. Evnin and R. Nivesvivat, Hidden symmetries of the Higgs oscillator and the conformal algebra, J. Phys.A 50 (2017) 015202 [arXiv:1604.00521] [INSPIRE].
3. O. Evnin and C. Krishnan, A hidden symmetry of AdS resonances, Phys. Rev.D 91 (2015) 126010 [arXiv:1502.03749] [INSPIRE].
4. O. Evnin and R. Nivesvivat, AdS perturbations, isometries, selection rules and the Higgs oscillator, JHEP01 (2016) 151 [arXiv:1512.00349] [INSPIRE].
5. S.P. Novikov, S.V. Manakov, L.P. Pitaevskii and V.E. Zakharov, Theory of solitons, Plenum, New York, NY, U.S.A. (1984).