Abstract
Acknowledgement. The authors thank the careful referee for some generous suggestions, which have improvedthe final version of this paper. The authors thank Lule˚a University of Technology for financial support for the research visit of the first authorin December 2015. The research of the first author was also supported by the MESRK grants 5540/GF4 and the research of the second author was supportedby the MESRK grants4080/GF4. The publication was supported by the Ministry of Education and Science of the Russian Federation (the Agreement number02.a03.21.0008).
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