Efektifitas uji fit alat pelindung respirasi dalam mencegah penurunan VEP1 akut yang dipicu oleh Kromium pada pengelas baja Stainless = Effect of respiratory protective equipment (RPE) fit testing aimed at preventing an acute decline in FEV1 induced by chromium in Stainless steel welder / Anna Suraya - Anna Suraya, author (2013)