Extremely elementary exercise in Quantum Mechanics of isotropic
harmonic oscillator, based on an inessential redefinition of
parameters and re-told in an unnecessarily complicated language of
creation/annihilation operators.

MR2485602 Ussembayev, Nail Sh. Oscillator representation for
pseudoharmonic potential. Internat. J. Theoret. Phys. 48 (2009), no.
3, 607--610. 81Q10 (81Q05 81R05)