References:
Hahn, RN, E.J., Rayens, PhD, M.K., York, RN, PhD, N., Zhang, RN, M., Dignan, PhD, Delaimy, MD, PhD, W.K. (2006) Effects of a Smoke-Free Law on Hair Nicotine and Respiratory Symptoms of Restaurant and Bar Workers. Journal of Occupational and Environmental Medicine, 48(9), 906 -- 913.
Magzamen, S., & Glantz, PhD, S.A. (2001) The New Battleground: California's Experience with Smoke-Free Bars. American Journal of Public Health, 91(2), 245 -- 252.