Exact solutions for potential V=(|x|-a)^2

[Kurret]

I heard that this potential is exactly solvable (ie one can find the eigenstates of the quantum mechanical problem exactly). However, I can not find a reference. I heard it is in Merzbacher, but I can not find it. Is it correct that this is exactly solvable? Can someone provide a good reference?

 

[Dr. Courtney]

http://www.sebastianbuhai.com/pictu...ematics/Quantum_physics/Double_oscillator.pdf

 

[Kurret]

Thanks!