DIN EN ISO 15970:2014 天然氣. 性能的測量. 容積性能: 密度, 壓力, 溫度和壓縮因子 (ISO 15970-2008); 德文版本EN ISO 15970-2014
Natural gas - Measurement of properties - Volumetric properties: density, pressure, temperature and compression factor (ISO 15970:2008); German version EN ISO 15970:2014