Sherwin, M. S, K.  Craig, B.  Galdrikian, J.  Heyman, A.  Markelz, K.  Campman, S.  Fafard, P. F Hopkins, and A.  Gossard. ?Nonlinear Quantum Dynamics In Semiconductor Quantum-Wells?. Physica D-Nonlinear Phenomena 83 (1995): 229-242. doi:10.1016/0167-2789(94)00266-S.