http://tobaccodocuments.org/bliley_ctr/1010.html
"HKO289OO8 452 5 AIR POLLUTI0 AND TRAFFIC SAFETY EXPERIENTIA SUPPL 20 CO): 55-60; 1974 TODOROVIC, P p". No date. http://tobaccodocuments.org/bliley_ctr/1010.html