By Tonkov Spassimir   Possnert Göran   Bozilova Elissaveta   in Vegetation History and Archaeobotany

ISSN:0939-6314|16|1|15-22

Springer Publishing Company ‎(2006)‎

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By Tonkov Spassimir   Bozilova Elissaveta   Jungner Hogne   in Grana

ISSN:0017-3134|48|3|235-237

Taylor & Francis Ltd‎(2009)‎

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