RT Journal Article SR Electronic T1 Butt clean up campaigns: wolves in sheep’s clothing? JF Tobacco Control JO Tob Control FD BMJ Publishing Group Ltd SP 273 OP 273 DO 10.1136/tc.2006.017590 VO 15 IS 4 A1 Chapman, Simon YR 2006 UL http://tobaccocontrol.bmj.com/content/15/4/273.abstract AB