Usability in online shops: scale construction, validation and the influence on the buyers' intention and decision. - Udo Konradt; Hartmut Wandke; Björn Balazs; Timo Christophersen (Behav. Inf. Technol., 2003)

Predicting user satisfaction, strain and system usage of employee self-services. - Udo Konradt; Timo Christophersen; Ute Schaeffer-Kuelz (Int. J. Hum. Comput. Stud., 2006)

Usability im Online-Shopping: Entwicklung eines Fragebogeninstrumentes (ufosV2) unter Berücksichtigung formativer und reflektiver Messmodelle - Timo Christophersen (2006)

Reliability, validity, and sensitivity of a single-item measure of online store usability. - Timo Christophersen; Udo Konradt (Int. J. Hum. Comput. Stud., 2011)

Development and validation of a formative and a reflective measure for the assessment of online store usability. - Timo Christophersen; Udo Konradt (Behav. Inf. Technol., 2012)

The Role of Usability in E-Commerce Services. - Udo Konradt; Gunther Held; Timo Christophersen; Friedemann W. Nerdinger (Int. J. E Bus. Res., 2012)

Measuring Psychological Constructs Using Single-Item Scales: Answers to Experts' Comments and Additional Questions. - Udo Konradt; Timo Christophersen (Interact. Comput., 2013)