This is an early access version, the complete PDF, HTML, and XML versions will be available soon. Open AccessArticle by Boris Lisjikh SciProfiles Scilit Preprints.org Google Scholar , Mikhail Kosobokov SciProfiles Scilit Preprints.org Google Scholar and Vladimir Shur SciProfiles Scilit Preprints.org Google Scholar * School of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg 620062, Russia * Author to whom correspondence should be addressed.