Steven Fraser Erik Lundh Rachel Davies Jutta Eckstein Diana Larsen Kati Vilkki Perspectives on Agile Coaching. 271-276 2009 XP http://dx.doi.org/10.1007/978-3-642-01853-4_62 conf/xpu/2009 db/conf/xpu/xp2009.html#FraserLDELV09