2000DIN EN ISO 1061:2000-02 Plastics - Unplasticized cellulose acetate - Determination of free acidity (ISO 1061:1990); German version EN ISO 1061:1999
2000DIN EN ISO 1061:2000 Plastics - Unplasticized cellulose acetate - Determination of free acidity (ISO 1061:1990); German version EN ISO 1061:1999