1. P. Najt, D. Foster, SAE paper 830264 (1983)
2. G. Haraldsson, P. Tunestal, B. Johansson, SAE paper 2003-02-1830 (2003)
3. S.S. Morimoto, Y. Kawabata, T. Sakurai, T. Amano, SAE paper 2001-01-1034 (2001)
4. N.B. Kaahaaina, A.J. Simon, P.A. Caton, C.F. Edwards, SAE paper 2001-01-0549 (2001)
5. J. Allen, D. Law, SAE paper 2002-01-0422 (2002)