The author wishes to thank Drs. H. Grassl and H. Hinzpeter for their useful comments and close interest in this study. Thanks also to Mrs. B. Zinecker for typing the manuscript. This work has received financial support by the German Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie (BMBF) within the project Schadstoffe in der Luftfahrt.
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