1. M. Ilieva-Obretenova, "Computer System for Microclimate Management in Closed Areas of the Post-Mining Galleries and Greenhouses." in 7th International Conference on Energy Efficiency and Agricultural Engineering (EE&AE), Ruse, 2020, 1-4, doi: 10.1109/EEAE49144.2020.9278785.
2. Ministry of labour and social policy. Healthy Workplaces Campaign, Pictograms 2018-2019, Sofia. (In Bulgarian)
3. https://russian.worldbuild365.com/news/nbs9ontsc/hvac/mikroklimat-po-gostu-chto-dolzhen-uchitivat-kazhdyy-proektirovschhik. Accessed June 2021.
4. B. Vladkova, Техническа безопасност, University of Mining and Geology "St. Ivan Rilski" - Sofia, 2020. (In Bulgarian)
5. G. Ganchev, Книга за осветлението. Минното осветление е тъмна работа, University of Mining and Geology - Sofia, 2018. (in Bulgarian)