1. Mang T, Dresel W (2007) Lubricants and lubrification, 2nd edn. Wiley-VCH GmbH, Weinheim. ISBN 978-3-527-31497-3
2. UNEP (2002) Basel convention: technical guidelines on used oil re-refinining of other re-uses of previously used oil. Available from Secretariat of the Basel Convention, International Environment House, Chatelaine, Switzerland
3. Vazquez-Duhalt R (1989) Environmental impact of used motor oil. Sci Total Environ 79(1):1–23
4. Mang T, Lingg G (2007) Base oils. In: Mang T, Dresel W (eds) Lubricants and lubrification, 2nd edn. Wiley-VCH GmbH, Weinheim. ISBN:978-3-527-31497-3
5. Dresel W (2007) Syntethic base oils. In: Mang T, Dresel W (eds) Lubricants and lubrification, 2nd edn. Wiley-VCH GmbH, Weinheim. ISBN:978-3-527-31497-3