R. Kudrawiec, M. Gladysiewicz, M. Motyka, J. Misiewicz, H. B. Yuen, S. R. Bank, M. A. Wistey, H. P. Bae, and J. S. Harris,"Contactless electroreflectance spectroscopy of Ga(In)NAs/GaAs quantum well structures containing Sb atoms,"Applied Surface Science,vol. 253, no. 1, pp. 152–157, Dec2006.