[1] North Caucasus Fed Univ, Dept Phys & Technol Nanostruct & Mat, Stavropol 355017, Russia
[2] Don State Tech Univ, Rostov Na Donu 344000, Russia
[3] Russian Acad Sci, Fed Res Ctr, Southern Sci Ctr, Chehova St 41, Rostov Na Donu 344006, Russia
[4] North Caucasus Fed Univ, Econ Secur & Auditing Dept, Stavropol 355017, Russia
[5] Technol Inst Serv, Dept Sci Res, Stavropol 355000, Russia
[6] KG Razumovsky Moscow State Univ Technol & Managem, Dept Sci Res, Cossack Univ 1, Moscow 109004, Russia
[7] St Petersburg State Agr Univ, St Petersburg 196601, Russia