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Copyright responsibility: Kr. Toneva
Source: Trakia journal of sciences
Year published: 2008
Volume: 3
Pages: pg. 13-17
ID: LTU090029841
Source: TRAKIA JOURNAL OF SCIENCES
Year published: 2017
Volume: Vol. 15
Pages: pp 56-61
Signature: Сп 387
ID: LTU090061182
Pages:
