D. Ivanov, T. Tenev, and E. Golkocheva-Markova, “PREVALENCE OF ANTI-HBC IN HBSAG-NEGATIVE POPULATION: SCREENING OF PATIENTS WITH UNSPECIFIED ACUTE HEPATITIS AND REVIEW OF THE LITERATURE”, Probl Infect Parasit Dis, vol. 48, no. 1, pp. 33–38, May 2020, doi: 10.58395/pipd.v48i1.31.