[1]
I. Trifonova, S. Angelova, and N. Korsun, “AETIOLOGICAL STRUCTURE OF ACUTE RESPIRATORY TRACT INFECTIONS AMONG CHILDREN YOUNGER THAN 5 YEARS IN BULGARIA”, Probl Infect Parasit Dis, vol. 47, no. 1, pp. 9–15, Jun. 2019, doi: 10.58395/pipd.v47i1.11.