http://tobaccodocuments.org/ahf/01066506-6531.html
Brunnemann, K.D.; Hoffmann, D. "Assessment of the Carcinogenic N-Nitrosodiethanolamine in Tobacco Products and Toabacco Smoke". 05 Jun 1981 (est.). Bates: 01066506-6531.
http://tobaccodocuments.org/ahf/01066506-6531.html