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Published in "Scientiae Horticulturae", 161 (2013) pp. 76-80
Authors: Krasimir Rusanova∗, Natasha Kovachevab, Mila Rusanovaa, Ivan Atanassova
a AgroBio Institute, 8 Dragan Tsankov Blvd, Sofia1164, Bulgaria
b Institute of Roses, Essential and Medical Cultures, 49 Osvobozhdenie Blvd, Kazanlak 6100,Bulgaria
∗ Corresponding author.Tel.:+35929635411; fax:+35929635408, email krusanov at abv.bg