Lipiec , A., M. Puc, M. Malkiewicz, K. Chłopek, B. Zielnik-Jurkiewicz, I. Winnicka, A. Rapiejko, K. Szczygielski, E. Kalinowska, and P. Rapiejko. “The Oak Pollen in the Air of Selected Polish Cities in 2013”. Alergoprofil, Vol. 9, no. 3, Oct. 2013, pp. 13-16, https://www.journalsmededu.pl/index.php/alergoprofil/article/view/769.