Puc , M., D. Kotrych, P. Rapiejko, A. Lipiec, A. Stacewicz, A. Chloupek, D. Jurkiewicz, G. Siergiejko, E. M. Świebocka, and A. Kompowska. “Ragweed Pollen Season in the Cities of Northern Poland in 2016”. Alergoprofil, Vol. 12, no. 4, Dec. 2016, pp. 178-81, https://www.journalsmededu.pl/index.php/alergoprofil/article/view/876.