Measurement techniques of piezoelectric, dielectric and electrostatic oscillators - Part 3: Frequency aging test methods (IEC 62884-3:2018); German version EN IEC 62884-3:2018— 15 стр.
Letter symbols to be used in electrical technology - Part 3: Logarithmic and related quantities, and their units (IEC 60027-3:2002); German version HD 60027-3:2004
Electrical engineering; basic environmental testing procedures; tests; test N: change of temperature; identical with IEC 60068-2-14, edition 1984 (status as of 1986)