Ivanova, A., N. Tsvetkova, R. Harizanov, and R. Borisova. “STUDY OF THE DISTRIBUTION OF PNEUMOCYSTOSIS IN BULGARIA BETWEEN SEPTEMBER 2017 AND APRIL 2019 BY USING REAL- TIME PCR”. PROBLEMS of Infectious and Parasitic Diseases, vol. 47, no. 2, Dec. 2019, pp. 24-27, https://pipd.ncipd.org/index.php/pipd/article/view/47_2_6_STUDY_OF_THE_DISTRIBUTION_OF_PNEUMOCYSTOSIS_IN_BULGARIA_B.