[1]: https://arxiv.org/abs/1005.1631

[2]: https://arxiv.org/abs/0912.5478

[3]: https://arxiv.org/abs/1210.0398

“Ground-state isolation and discrete flows in a rationally extended quantum harmonic oscillator” by José F. Cariñena, Mikhail S. Plyushchay http://arxiv.org/abs/1611.08051

“Schwarzian derivative treatment of the quantum second-order supersymmetry anomaly, and coupling-constant metamorphosis” by Mikhail S. Plyushchay, http://arxiv.org/abs/1602.02179

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