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2. M. Nishioka, B. Petersen, J. Lewtas, Paper presented at EPA Diesel Emission Symposium, October, 1981, Raleight, North Carolina, U.S.A.
3. T. Pederson, J. S. Siak, Paper presented at EPA Symposium (see ref. [2] October, 1981, Releigh, North Carolina, U.S.A.).
4. M. Quillian, F. Messier, C. Lu, P. Andrews, B. McCarry, D. McCalla, Paper presented at EPA Symposium (see ref. [2] October, 1981, Raleigh, North Carolina, U.S.A.)
5. J. Cole, C. F. Arlett, J. Lowe, B. Bridges, Mutat. Res.93, 213 (1982).