The Software Architecture of DIGIS. - Hans de Bruin; Peter Bouwman (HCI (2), 1993)

DIGIS: A Graphical User Interface Design Environment for Non-Programmers. - Hans de Bruin; Peter Bouwman; Jan van den Bos (Comput. Graph. Forum, 1993)

Modeling and Analyzing Human-Computer Dialogues with Protocols. - Hans de Bruin; Peter Bouwman; Jan van den Bos (DSV-IS, 1994)

Talktalk. - Peter Bouwman; Hans de Bruin (Workshop on Object-Oriented Graphics, 1994)

Visually Specifying Human-Computer Dialogues in DIGIS. - Peter Bouwman; Hans de Bruin; Jan van den Bos (VL, 1994)