Pencheva, V., Kolevski, A. and Kandilarova, S. 2025. Comparison of Anti-receptor Binding Domain of SARS-CoV-2 Spike Protein Humoral Response between Infected, Vaccinated and Vaccinated after Natural Exposure Subjects over 12-months Follow-up Period. Proceedings of the Bulgarian Academy of Sciences. 78, 3 (Mar. 2025), 441–449. DOI:https://doi.org/10.7546/CRABS.2025.03.14.