Author

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Mariya Petrova            
"St. Cyril and St. Methodius" University of Veliko Tarnovo
Veliko Tarnovo, Bulgaria
3 articles by this author
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Research Article
 Unique: 299 | Total: 371  | Access Period:
 79-85
Review Article
 14-08-2019
 Unique: 390 | Total: 654  | Access Period:
 18-22

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