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6th International Multidisciplinary Scientific Conference on SOCIAL Sciences and Arts SGEM2019/ Conference proceedings. Vol. 624 August - 2 September, Albena, 2019.

Vol. 624: 6th International Multidisciplinary Scientific Conference on SOCIAL Sciences and Arts SGEM2019/ Conference proceedings. . Iss. 6: 6th International Multidisciplinary Scientific Conference on SOCIAL Sciences and Arts SGEM2019/ Conference proceedings. . СТЕФ92 Технолоджи (София) , 2019.
Sakhno I., Lapshin I.
6th International Multidisciplinary Scientific Conference on SOCIAL Sciences and Arts SGEM2019/ Conference proceedings. Vol. 624 August - 2 September, Albena, 2019.