Steven Fraser Pekka Abrahamsson Rachel Davies Joshua Kerievsky Mary Poppendieck Giancarlo Succi The Future of Lean in an Agile World. 263-266 2009 XP http://dx.doi.org/10.1007/978-3-642-01853-4_60 conf/xpu/2009 db/conf/xpu/xp2009.html#FraserADKPS09