[5] Zhu Dongpei. A new potential with the spectrum of an isotonic oscillator. J. Phys. (A), 1987, 20(13):4331~4336
[7] Zhu Jiuyun, Kuang Leman. Even and odd coherent states of a harmonic oscillator in a finite-dimensional Hilbert space and their squeezing properties. Phys. Lett. (A), 1994, 193(3):227~234