Johannes Koch Dirk Stegemann Yehya Mohamad Carlos A. Velasco Development of Automatic Web Accessibility Checking Modules for Advanced Quality Assurance Tools. 406-413 2007 conf/hci/2007-5 HCI (5) http://dx.doi.org/10.1007/978-3-540-73279-2_45 db/conf/hci/hci2007-5.html#KochSMV07