Absorption spectrum of atoms in nonresonance biharmonic radiation fields

Subradiative structure in the absorption spectrum of a two-level system in a biharmonic radiation field

Susceptibility spectrum of a two-level system in a biharmonic light field

Nonresonant Excitation of the Atomic Spectrum in a Light Field

Nonresonance perturbation of an atomic spectrum in a strong light field

Optical spectra of a two-level atom in a quantized biharmonic field

Two-level atom in a biharmonic field