Remote Usability Tests - An Extension of the Usability Toolbox for Online-Shops. - Tim Bosenick; Steffen Kehr; Martina Kühn; Stephan Nufer (HCI (5), 2007)

From a Distance: Usability Testing aus der Ferne. - Olde Lorenzen-Schmidt; Stephan Nufer (i-com, 2008)