1. , and , ‘Environmentally acceptable hydraulic fluids based on natural synthetic esters’, SAE 1998 Earthmoving Industry Conf., Peoria, Illinois, 8–9 April 1998.
2. , and , ‘Environmentally adapted lubricants in the Nordic marketplace — recent developments’, Proc. 13th Int. Colloquium Tribology, Technische Akademie Esslingen, Germany, 15–17 January 2002, pp. 293–9.
3. Hydraulic Fluids, John Wiley, New York, 1996, pp. 48–9.
4. Swedish standard SS155434, 4th edition, ‘Hydraulic fluids — requirements and test methods’.
5. International standard ISO 15380:2002, ‘Lubricants, industrial oils and related products (class L) — Family H (hydraulic systems) — Specifications for categories HETG, HEPG, HEES and HEPR’.