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4 International multidisciplinary scientific conference of social sciences and arts

Vol. 2. Bk. 2. Sofia: Albena Co., 2017.

Information in the SGEM 2017 Conference Proceedings is subject to change without notice. No part of this book may be reproduced or transmitted in any form or by any means, electronic or mechanical, for any purpose, without the express written permission of the International Scientific Council of SGEM.

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4 International multidisciplinary scientific conference of social sciences and arts