Comparing web based course development with and without a learning environment. - Rob J. M. Hartog; Kees de Gooijer; Olivier Sessink; Hylke van der Schaaf; Oscar W. Vonder (WebNet, 2000)

Author-Defined Storage in the Next Generation Learning Management Systems. - Olivier Sessink; Rik Beeftink; Johannes Tramper; Rob J. M. Hartog (ICALT, 2003)

Securing Web-Based Exams. - Olivier Sessink; Rik Beeftink; Johannes Tramper; Rob J. M. Hartog (J. Univers. Comput. Sci., 2004)