Monochromatic waves in an amplifying two-level system

Interaction of two-level systems with a strong monochromatic wave and with a thermostat

Quasienergy of a two-level system in an intense monochromatic field

Propagation of quasi-monochromatic plane waves in absorbing and amplifying media

Quantum transitions in a two-level system in a field of intense monochromatic influx

Absorption spectrum of a two-level system interacting with two monochromatic fields of equal amplitudes

The resonant two-level spin system in a monochromatic magnetic field