P. Gábor, S. Jombach, and R. Ongjerth, “Changes in biological activity in Budapest and the Budapest Agglomeration between 1990 and 2005”, 4D, no. 5, pp. 21–28, Feb. 2007, Accessed: Dec. 05, 2025. [Online]. Available: https://journal.uni-mate.hu/index.php/4D/article/view/5914