Beyond web content accessibility guidelines: Design of enhanced text user interfaces for blind internet users. - Stefan Leuthold; Javier A. Bargas-Avila; Klaus Opwis (Int. J. Hum. Comput. Stud., 2008)

Error prevention in online forms: Use color instead of asterisks to mark required-fields. - Stefan L. Pauwels; Christian Hübscher; Stefan Leuthold; Javier A. Bargas-Avila; Klaus Opwis (Interact. Comput., 2009)

Vertical versus dynamic menus on the world wide web: Eye tracking study measuring the influence of menu design and task complexity on user performance and subjective preference. - Stefan Leuthold; Peter Schmutz; Javier A. Bargas-Avila; Alexandre N. Tuch; Klaus Opwis (Comput. Hum. Behav., 2011)