DIN 58959-20 E:1991-11 Quality management in medical microbiology - Part 20: Requirements for the use of control material for the examination of protozoae and microorganisms of higher order
1997DIN 58959-20:1997-06 Quality management in medical microbiology - Part 20: Requirements for the use of control material for the examination of protozoae and microorganisms of higher order
1997DIN 58959-20:1997 Quality management in medical microbiology - Part 20: Requirements for the use of control material for the examination of protozoae and microorganisms of higher order
1970DIN 58959-20 E:1991-11 Quality management in medical microbiology - Part 20: Requirements for the use of control material for the examination of protozoae and microorganisms of higher order