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By: Bozhilova, Mariam - Zhiyanski, Miglena - Glogov, PlamenType: ArticleIn: Silva BalcanicaVolume: 21Series:Issue: 2Date: 2020-10-6Page Range: 99--104Publication Info: Sofia, Bulgaria Forest Research Institute - Bulgarian Academy of Sciences (FRI-BAS) [2001]-Subjects: efficiency green roofs regional legislation substrate depth