Angelovska, Irina, 		Karkinski, Dimitar, 		Debreslioska, Angela, 		Grueva-Karanfilova, Ada, 		Miletic, Milena, AND 		Dokic, Dejan.
" ASSESMENT OF INFECTIOUS ETHYOLOGY IN SEVERE EXACERBATIONS OF CHRONIC OBSTRUCTIVE PULMONARY DISEASE; RELATIONSHIP WITH RESPIRATORY FAILURE" <em>Journal of Morphological Sciences</em> [Online], Volume 4 Number 2 (26 July 2021)