http://tobaccodocuments.org/product_design/500606735-6744.html
Long, M.E.; Mansfield, C.T.; Nystrom, Charles W. "Review of Nicotine Biosythesis". 15 Sep 1977. Bates: 500606735 -6744. http://tobaccodocuments.org/product_design/500606735-6744.html