The effect of damping on a quantum system containing a Kerr-like medium A. -B. A. Mohamed, M. Sebawe Abdalla and A. -S. F. Obada Eur. Phys. J. Plus, 133 5 (2018) 190 Published online: 18 May 2018 DOI: 10.1140/epjp/i2018-12023-1