| The contact details of authors: | 1. Kuznetsov, Yevgeniy Yevgenevich Candidate of Phys.&Math., Assoc. Professor of Department of building, building materials and designs, Tula State University, Tula
2. Mattchenko, Ilya Nikolaevich Dr. of Phys. & Math. Sci., Assoc. Professor of department of building, city construction and architecture, Tula State University, Tula
3. Mattchenko, Nikolay Mihailovich Dr. of Phys. & Math. Sci., Professor, Department of mechanics plastic forming, Tula State University, Tula
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