Julius Kullig, Clemens Löbner, Normann Mertig, Arnd Bäcker, Roland Ketzmerick, “Integrable approximation of regular regions with a nonlinear resonance chain”, Phys. Rev. E, 90:5 (2014)
Bruno Eckhardt, Gabriel Hose, Eli Pollak, “Quantum mechanics of a classically chaotic system: Observations on scars, periodic orbits, and vibrational adiabaticity”, Phys. Rev. A, 39:8 (1989), 3776