Acoustics; measurement of sound insulation in buildings and of building elements; part 2: determination, verification and application of precision data (ISO 140-2:1991); German version EN 20140-2:1993
声学建筑物和建筑构件的隔音测量;第2部分:精度数据的测定、验证和应用(ISO 140-2-1991);德文版EN 20140-2:1993