Ruslan I. Kostov, University of Mining and Geology “St Ivan Rilski”, Bulgaria; Hristo Protohristov, Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Bulgaria; Savka Marinova, Plovdiv University “Paisiy Hilendarski”, Bulgaria; Ivanka Tringovska, Maritsa Vegetable Crops Research Institute, Bulgaria

REGATA IBR-2