ISO 6225-2:1983 Rubber, raw, natural — Determination of castor oil content — Part 2: Determination of total ricinoleic acid content — Gas chromatographic method
1990ISO 6225-2:1990 Rubber, raw, natural; determination of castor oil content; part 2: determination of total ricinoleic acid content by gas chromatography
1983ISO 6225-2:1983 Rubber, raw, natural — Determination of castor oil content — Part 2: Determination of total ricinoleic acid content — Gas chromatographic method