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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)

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ISSN: 2256-0823