2002IEC 60027-3:2002 Letter symbols to be used in electrical technology - Part 3: Logarithmic and related quantities, and their units
2000IEC 60027-3/AMD1:2000 Letter symbols to be used in electrical technology - Part 3: Logarithmic quantities and units; Amendment 1
1989IEC 60027-3:1989 Letter symbols to be used in electrical technology; part 3: logarithmic quantities and units
IEC 60027-3/AMD1:2000 Letter symbols to be used in electrical technology - Part 3: Logarithmic quantities and units; Amendment 1 was changed to IEC 60027-3:2002 Letter symbols to be used in electrical technology - Part 3: Logarithmic and related quantities, and their units.