Abstract
Communicated by Ramaswamy H. Sarma
Acknowledgements
The results of the work were obtained using computational resources of Department of Information and Computational Technologies of the St. Petersburg State Polytechnic University (http://www.spbstu.ru). We thank Mr. Edward Ramsay for help in writing the manuscript and Dr. D.V. Lebedev (DMRB PNPI NRC KI) for fruitful discussion of the experiments.
Disclosure statement
No potential conflict of interest was reported by the authors.