the presence of the Belavin-Polyakov-Schwarz-Tyupkin instanton by the reduction from the
free particle on (2 n+ 1)-dimensional complex projective space. Then we add to this system
a “quaternionic oscillator potential” and show that this oscillatorlike system is
superintegrable. We show that, besides the analogs of quadratic constants of motion of the
spherical (Higgs) and CP n oscillators, it possesses the third-order constants of motion …