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Ulnicāns, Einārs, Rēzeknes Augstskolas (Latvia)
Ulnicāns, Einārs, Rezekne Academy of Technologies, Latgale National Economy research Institute (Latvia)
Ulnicāns, Einārs, Rezekne Academy of Technologies (Latvia)
Ulvidiene, Erstida, Vilnius University (Lithuania)

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ISSN: 2256-0955