Celik, Dogancan, and Erdal Aydemir. “Investigation of Air Quality Levels on 19-Day National Lockdown Period for Covid-19 of Isparta City in 2020 Using Grey Incidence Analysis”. International Conference on Modern and Advanced Research (August 3, 2023): 330–333. Accessed November 22, 2024. https://as-proceeding.com/index.php/icmar/article/view/1305.