RT Journal Article SR Electronic T1 Exposure to environmental tobacco smoke in public places in Barcelona, Spain JF Tobacco Control JO Tob Control FD BMJ Publishing Group Ltd SP 83 OP 84 DO 10.1136/tc.11.1.83 VO 11 IS 1 A1 M Jané A1 M Nebot A1 X Rojano A1 L Artazcoz A1 J Sunyer A1 E Fernández A1 M Ceraso A1 J Samet A1 S K Hammond YR 2002 UL http://tobaccocontrol.bmj.com/content/11/1/83.abstract AB