1. [Paper filters for purification of air from microorganisms and dust in ventilation]. Author SHAFIR AI, KOUZOV PA, and PANSHINSKAIA NM Subjects Humans, Air Pollution, Dust, Paper, Respiration, Ventilation Published 1953
2. [Paper filters for purification of air from microorganisms and dust in ventilation] Author A I, SHAFIR, P A, KOUZOV, and N M, PANSHINSKAIA Subjects Paper, Air Pollution, Respiration, Humans, Dust, Ventilation Published 1953