Collapse-revival phenomenon for different configurations of a three-level atom interacting with a field via multi-photon process and nonlinearitiesAbdel-Shafy Fahmy Obada, Sadek Ahmed Hanoura and Abdel-Hameed EiedEur. Phys. J. D, 68 2 (2014) 18DOI: https://doi.org/10.1140/epjd/e2013-30627-3