1. (1) Onishi S, Jo SH, Shoda K, Jo PD, Kato, SAE paper 790501
2. (2) Najt PM, Foster DE,. SAE paper 830264
3. (3) Takeda Y, Keiichi N, Keiichi N, SAE paper 961163
4. (4) Aoyama T, Hattori Y, Mizuta J, Sato Y, SAE paper 960081
5. (5) Ishibashi Y, Asai M, SAE paper 960742