1. Research Institute of Physics, I. I. Mechnikov National University, Vul. Pastera, Number 27, Odessa 65082, Ukraine
2. Schlesierstraße 5, D-61381 Friedrichsdorf, Germany; formerly, Battelle-Institut e.V., Frankfurt am Main, Germany
3. Number 42 Tanton Road, Stokesley, Middlesbrough TS9 5HR, United Kingdom; formerly, School of Science and Engineering, Teesside University, Middlesbrough, United Kingdom