1. B.F. Levine, C.G. Bethea, G.H Asnain, J.W Alker and R.J. Malik. GaAs/AlGaAs quantum well long-wavelength infrared detector, Electron.Lett. 24:747 (1988).
2. N S. Rytova. Resonant electromagnetic wave absorption in a thin film, Sov.Phys.Solid State 8:2136 (1966).
3. A. Shik. Intraband photoconductivity of quantum-well heterosLructures, Sov.Phys.Semicond. 20:1002 (1986).
4. A. Shik. Optical absorption aT a heterojunction, Sov.Phys. Semicond.22:1165 (1988).
5. G.B. Astard. Superlattioe band structure in the envelope-function approximation. Physl Rev. B 24:5693 (1981).