. osev1, I. Simeonov2, G. Djakova3, Ts. Hvarleva1* 1Agrobioinstitute, Agricultural Academy, 8 Dragan Tsankov, 1164 Sofia, Bulgaria 2Instiute of iticulture and Enology, Agricultural Academy, 5800 Pleven, Bulgaria 3Institute of Agriculture and Seed Science, Agricultural Academy, 7007 Ro
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