Kounchev, O., Boyadzhiev, G., Simeonov, G., Kunchev, M. and Kuncheva, Z. 2023. Implementation of Hidden Infections in the SEIR Model Analysis of the Omicron Variant Spread in Bulgaria. Proceedings of the Bulgarian Academy of Sciences. 76, 6 (Jun. 2023), 953–961. DOI:https://doi.org/10.7546/CRABS.2023.06.16.