1. The intractable cigarette ‘filter problem;Harris;Tob Control,2011
2. Marketing cigarettes with low machine measured yields;Pollay,2001
3. Cobben M . Capsule rollout. Hampshire, United Kingdom: British American Tobacco, 2011. http://www.bat.com/group/sites/UK__8GLKJF.nsf/vwPagesWebLive/3FF4B58C81321BC8C12578880056EF37/$FILE/14_Mark%20Cobben%20-%20Capsule%20Rollout.pdf?openelement
4. Game changers and category killers—the tobacco future;Hedley;Tob J Int,2013