1. Thring, R. H., SAE paper 89-2068.
2. Stanglmaier, R. H., and Roberts, C. A., SAE paper 99-3682.
3. Christensen, M., and Johansson, B., SAE paper 98-2454.
4. Christensen, M., Johansson, B., Amneus, P., and Mauss, F., SAE paper 98-0787.
5. Richter, M., Franke, A., Alden, M., Hultqvist, A., and Johansson, B., SAE paper 99-3649.