Markelz, A.G., E. G Gwinn, M. S Sherwin, J. N Heyman, C.  Nguyen, and H.  Kroemer. ?Far-Infrared Harmonic Generation From Semiconductor Heterostructures?. Spie Proceedings, 1994.

Markelz, A. G, E. G Gwinn, M. S Sherwin, C.  Nguyen, and H.  Kroemer. ?Giant 3Rd-Order Nonlinear Susceptibilities For Inplane Far-Infrared Excitation Of Single Inas Quantum-Wells?. Solid-State Electronics 37 (1994): 1243-1245. doi:10.1016/0038-1101(94)90399-9.

Markelz, A. G, N. G Asmar, E. G Gwinn, M. S Sherwin, C.  Nguyen, and H.  Kroemer. ?Subcubic Power Dependence Of 3Rd-Harmonic Generation For Inplane, Far-Infrared Excitation Of Inas Quantum-Wells?. Semiconductor Science And Technology 9 (1994): 634-637. doi:https://doi.org/10.1088/0268-1242/9/5S/063.