Natural gas - Designation of the quality of natural gas for use as a compressed fuel for vehicles (ISO 15403:2000); German version EN ISO 15403:2005— 28 стр.
Natural gas - Natural gas for use as a compressed fuel for vehicles - Part 1: Designation of the quality (ISO 15403-1:2006); German version EN ISO 15403-1:2008— 32 стр.