Kiziewicz , B., B. Gajo, and P. Kosieliński. “Allergic Pollen in the Air of Bialystok in 2012”. Alergoprofil, Vol. 9, no. 1, Apr. 2013, pp. 16-21, https://www.journalsmededu.pl/index.php/alergoprofil/article/view/753.