Nikolov, B. ., S. . Petrova, V. . Naydenova, and D. . Karagyozova-Dilkova. “INTERACTIVE METHODS OF TRAINING IN SUSTAINABLE WASTE MANAGEMENT”. Proceedings of CBU in Natural Sciences and ICT, vol. 2, Oct. 2021, pp. 81-86, doi:10.12955/pns.v2.157.