DIN EN ISO 3993:1995
液化石油气和轻质烃类.密度或相对密度的测定.压力液体比重测定法 (ISO 3993:1984); 德文版本 EN ISO 3993:1995
Liquefied petroleum gas and light hydrocarbons - Determination of density or relative density - Pressure hydrometer method (ISO 3993:1984); German version EN ISO 3993:1995