Yordanova, V. ., Dimitrova , S. ., Marinova, M. ., Valcheva, D. ., Kirchev, V. ., & Tcherkezov, T. . (2022). Retrospective Analysis of COVID 2020 Epidemiological Data in the Town of Kardzhali. International Journal of Medical Science and Clinical Invention, 9(01), 5924–5930. https://doi.org/10.18535/ijmsci/v9i01.07