Iliev, M., Ilieva, R., Nedkov, I., Pelkin, A. and Terziyska, V. 2025. Seasonal Variability of Ambient Bioaerosol Concentrations over Densely Populated Central Area in Sofia, Bulgaria: Focus on Spring and Summer. Proceedings of the Bulgarian Academy of Sciences. 78, 3 (Mar. 2025), 331–339. DOI:https://doi.org/10.7546/CRABS.2025.03.02.