by Han, H., Beyer, A., Jandieri, K., Gries, K.I., Duschek, L., Stolz, W., Volz, K.
Published in Micron (Oxford, England : 1993) (01.12.2015)

by Abdulmunem, O. M., Hassoon, K. I., Völkner, J., Mikulics, M., Gries, K. I., Balzer, J. C.
Published in Journal of infrared, millimeter and terahertz waves (01.05.2017)