Quantum statistical characteristics of the interaction between two two-level atoms and radiation fieldM. Sebawe Abdalla, E. M. Khalil, A. S. -F. Obada, J. Peřina and J. KřepelkaEur. Phys. J. Plus, 130 11 (2015) 227DOI: https://doi.org/10.1140/epjp/i2015-15227-9