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Upeniece, Irēna, Рижский университета им. П.Страдиня (Latvia)
Urlińska, Maria Marta, Nicolaus Copernicus University in Toruń (Poland)
Ušča, Svetlana, Rezekne Academy of Tehcnologies (Latvia)
Ušča, Svetlana, Rēzeknes Augstskola (Latvia)
Ušča, Svetlana, Rezekne Academy of Technologies (Latvia)

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ISSN: 2256-0823