The Pions Graphics System. - Jürgen Bettels; David R. Myers (IEEE Computer Graphics and Applications, 1986)

Guidelines for determining when to use GKS and when to use PHIGS. - Jürgen Bettels; Peter R. Bono; Eileen McGinnis; Joachim Rix (Comput. Graph., 1989)

Unicode: A Universal Character Code. - Jürgen Bettels; F. Avery Bish (Digit. Tech. J., 1993)

The X/Open Internationalization Model. - Wendy Rannenberg; Jürgen Bettels (Digit. Tech. J., 1993)