Y. J. Ding, D. C. Reynolds, S. J. Lee, J. B. Khurgin, W. S. Rabinovich, and D. S. Katzer, "Evidence for strong spatially localized band-filling effects in interface islands for extremely low laser intensities,"
in Quantum Electronics and Laser Science Conference, J. Bokor, R. Slusher, P. Bucksbaum, and R. Falcone, eds.,
Vol. 12 of OSA Technical Digest
(Optical Society of America, 1997), paper QFF2.