title: [Certain principal problems of classification of chronic nonspecific pneumonia in children].
mesh_terms: D002648:Child; D002908:Chronic Disease; D006801:Humans; D011014:Pneumonia / Q000145:classification*
vernacular_title: Nekotorye printsipial'nye voprosy klassifikatsii khronich eskikh nespetsificheskikh pnevmoniĭ u deteĭ