[IEEE Fourth International Kharkov Symposium 'Physics and Engineering of Millimeter and Sub-Millimeter Waves' - Kharkov, Ukraine (4-9 June 2001)] Fourth International Kharkov Symposium 'Physics and Engineering of Millimeter and Sub-Millimeter Waves'. Symposium Proceedings (Cat. No.01EX429) - Investigation of the detection, mixing and frequency multiplication in the planar semiconductor elements based on the high doped GaAs/AlAs superlattices in MM and SBMM wavelength bands