Sukhum DbarRomanS.Abkhazian State University, 1 Universitetskaya Str., Sukhum 384904, Republic of Abkhaziaromandbar@mail.ru Read more about Dbar Roman S. MalandziaViktor I.Abkhazian State University, 1 Universitetskaya Str., Sukhum 384904, Republic of Abkhaziamalandzia@mail.ru Read more about Malandzia Viktor I.