Lipiec , A., D. Myszkowska, M. Puc, K. Piotrowska, E. Weryszko-Chmielewska, A. Rapiejko, E. Świebocka, M. Modrzyński, K. Korzeniewska, M. Hermanowski, J. Usowski, P. Rapiejko, and I. Winnicka. “The Analysis of Poplar Pollen Count in Selected Polish Cities in 2008”. Alergoprofil, Vol. 4, no. 3, Oct. 2008, pp. 53-56, https://www.journalsmededu.pl/index.php/alergoprofil/article/view/91.