| 2018 | ICCHP | Group-Based Expert Walkthroughs to Compensate for Limited Access to Target User Groups as in Case of Chronically Ill Patients. | Henrike Gappa, Gaby Nordbrock, Yehya Mohamad, Carlos A. Velasco |
| 2018 | ICCHP | Evaluation of an Information System for Elderly with Chronic Diseases and for Their Caregiver. | Yehya Mohamad, Henrike Gappa, Gaby Nordbrock, Carlos A. Velasco |
| 2016 | ICCHP | Study on Elicitation and Detection of Emotional States with Disabled Users. | Yehya Mohamad, Gaby Nordbrock, Henrike Gappa, Carlos A. Velasco |
| 2012 | ICCHP | Controlled Natural Language Sentence Building as a Model for Designing User Interfaces for Rule Editing in Assisted Living Systems - A User Study. | Henrike Gappa, Gaby Nordbrock, Yehya Mohamad, Jaroslav Pullmann, Carlos A. Velasco |
| 2007 | HCI | The Usability of Accessibility Evaluation Tools. | Helen Petrie, Neil King, Carlos A. Velasco, Henrike Gappa, Gaby Nordbrock |
| 2004 | ICCHP | IPCA: Adaptive Interfaces Based upon Biofeedback Sensors. | Carlos A. Velasco, Yehya Mohamad, Dirk Stegemann, Henrike Gappa, Gaby Nordbrock, Erwin Hartsuiker, Javier Snchez-Lacuesta, Juan Manuel Belda |