Samuliak, R. V. 1995. “Generalized Dicke Model As an Integrable Dynamical System Inverse to the Nonlinear Schrödinger Equation”.
Ukrains’kyi Matematychnyi Zhurnal
47 (1): 126–128.
https://umj.imath.kiev.ua/index.php/umj/article/view/5393
.