Air quality during SARS-CoV-2 (COVID-19) lockdown in Sarajevo. Periodicals of Engineering and Natural Sciences, [S. l.], v. 8, n. 2, p. 884–892, 2020. DOI: 10.21533/pen.v8.i2.1114. Disponível em: https://pen.ius.edu.ba/index.php/pen/article/view/1114. Acesso em: 18 apr. 2026.