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Authors: Roumiana Peytcheva-Forsyth, Blagovesna Yovkova, Lyubka Aleksieva
Journal title: INTED2019 Proceedings
Journal publisher: IATED
Published year: 2019
Published pages: 2862-2871
DOI identifier: 10.21125/inted.2019.0763
ISBN: 978-84-09-08619-1