PANAYOTOVA, E.; CHRISTOVA, I.; TRIFONOVA, I.; TASEVA, E.; GLADNISHKA, T.; IVANOVA, V. SEROPREVALENCE OF WEST NILE VIRUS IN BULGARIA, 2018. PROBLEMS of Infectious and Parasitic Diseases, v. 47, n. 2, p. 15-17, 30 Dec. 2019.