A. Smirl, S. A. Hawkins, M. J. Stevens, E. J. Gansen, K. Jarasiunas, A. L. Smirl, and D. G. Steel, "Differential measurements of interband and intersubband coherence and exciton-exciton correlations in quantum wells,"
in Nonlinear Optics: Materials, Fundamentals and Applications, T. Li, ed.,
Vol. 46 of OSA Trends in Optics and Photonics
(Optical Society of America, 2000), paper TuA2.