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1by Radoslava Stoyanova, Stoil Tomov, Elenka Georgieva, Pepa Atanassova, Ivan Dechev, Vesela Yancheva, Slaveya Petrova, Stela Stoyanova“...Union of Scientists in Bulgaria...”
Published 2019-06-01
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3by Elenka Georgieva, Pepa Atanasova, Iliana Velcheva, Stela Stoyanova, Vesela Yancheva“...Union of Scientists in Bulgaria...”
Published 2013-12-01
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