1. Physics Department, Oakland University, Rochester, MI 48309-4401, USA
2. Radiophysics Department, Taras Shevchenko National University of Kyiv, Kyiv, 01601, Ukraine
3. Institute of Electronic and Information Systems, Novgorod State University, Veliky Novgorod 173003, Russia
4. Chemistry Department, Oakland University, Rochester, MI 48309-4401, USA