1. Nielsen T (1981) Nitro derivatives of polynuclear aromatics: Formation, presence and transformation in stack and exhaust gases and in the atmosphere. Riso National Laboratory, DK-4000 Roskilde, Denmark
2. Nielsen T (1984) Environ Sci Technol 18: 157
3. Rosenkranz HS, Mermelstein R (1983) Mutat Res 114: 217
4. Hirose M, Lee M-S, Wang CY, King CM (1984) Cancer Res 44: 1158
5. Mücke W (1988) Das öffentliche Gesundheitswesen 50: 147