Spectra of a weakly driven two-level atom in an off-resonant squeezed vacuum S. S. Hassan, A. Joshi and M. F.M. Ali Eur. Phys. J. D, 26 3 (2003) 301-306 Published online: 26 August 2003 DOI: 10.1140/epjd/e2003-00264-8