1. [1] ISO 15380 “Lubricants, industrial oils and related products (class L) - Family H (Hydraulic systems) - Specifications for categories HETG, HEPG, HEES, and HEPR,” 2002.
2. [2] OECD 301 “OECD Guideline for Testing of Chemicals,” 1992.
3. [3] Internet pages of the Market Introduction Program: http://www.bioschmierstoffe.info/ (in German)
4. [4] Theissen, H., “The Market Situation of Biode-Gradable and Biobased Lubricants in Germany 2006,” Aachen 2006, http://www.bioschmierstoffe.info. (in German)
5. [5] ASTM D 6866 - 04a: “Standard Test Methods for Determining the Biobased Content of Natural Range Materials Using Radiocarbon and Isotope Ratio Mass Spectrometry Analysis,” 2004.