Kiffner, M., Evers, J., & Keitel, C. (2007). Breakdown of the few-level approximation in dipole-dipole interacting systems.

Kiffner, M., J. Evers, and C. Keitel. Breakdown of the Few-level Approximation in Dipole-dipole Interacting Systems. 2007.

Kiffner, M., et al. Breakdown of the Few-level Approximation in Dipole-dipole Interacting Systems. 2007.