Shmatkov, D., A. Shelkovyj, and N. Bielikova. 2019. “Vertical Reduction of the Learning Content of the Topic ‘Waste observation’ of the Discipline “Environmental Monitoring”. Problems of Engineer-Pedagogical Education, no. 61 (April):83-94. https://doi.org/10.32820/2074-8922-2018-61-83.