Quality requirements for fusion welding of metallic materials - Part 5: Documents with which it is necessary to conform to claim conformity to the quality requirements of ISO 3834-2, ISO 3834-3 or ISO 3834-4 (ISO 3834-5:2015); German version EN ISO 3834-5:2015— 17 стр.
Liquid petroleum products - Determination of nickel and vanadium content - Atomic absorption spectrometric method; German version EN 13131:2000— 8 стр.