By Popov L.   Mihailova G.   Naidenov I.   in Journal of Radioanalytical and Nuclear Chemistry

ISSN:0236-5731|285|2|223-237

Springer Publishing Company ‎(2010)‎

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By Velitchkova M.   Doltchinkova V.   Lazarova D.   Mihailova G.   Doncheva S.   Georgieva K.   in Photosynthetica

ISSN:0300-3604|51|4|630-640

Springer Publishing Company ‎(2013)‎

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