Yancheva, N. et al. 2020. Mortality rate and prognostic factors for poor outcome in HIV-infected Bulgarian patients with Pneumocystis pneumonia over a 3-year period . PROBLEMS of Infectious and Parasitic Diseases. 48, 3 (Dec. 2020), 16–20. DOI:https://doi.org/10.58395/pipd.v48i3.47.