Dynamics of three-level Λ-type atom interacting with one mode cavity field with both classical gravity and quantum radiation: Lie algebra approachN. H. Abd El-Wahab, A. S. Abdel Rady, Abdel-Nasser A. Osman and Ahmed SalahEur. Phys. J. Plus, 130 10 (2015) 207DOI: https://doi.org/10.1140/epjp/i2015-15207-1