Rapiejko , Adam, Agnieszka Lipiec, and Ewa Kalinowska. 2014. “Characteristics of Pollen Seasons of Hazel, Alder and Birch in Zielona Gora in 2014”. Alergoprofil 10 (2), 49-52. https://www.journalsmededu.pl/index.php/alergoprofil/article/view/802.