- Submitted: 15 July 2016
- Revision received 8 November 2016
- Accepted: 3 February 2017
- Published March 3, 2017.
Copyright & Usage
© 2017 Tikhonov and Zhorov http://www.rupress.org/terms/https://creativecommons.org/licenses/by-nc-sa/4.0/This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.rupress.org/terms/). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 4.0 International license, as described at https://creativecommons.org/licenses/by-nc-sa/4.0/).
Natural Sciences and Engineering Research Council of Canada
Russian Foundation of Basic Research
Russian Academy of Sciences