Figaro: Yet Another Constraint Programming Library. - Martin Henz; Tobias Müller 002; Ka Boon Ng (Parallelism and Implementation Technology for (Constraint) Logic Programming@ICLP, 1999)

A Toolkit for Constraint-Based Inference Engines. - Tee Yong Chew; Martin Henz; Ka Boon Ng (PADL, 2000)

Components for State Restoration in Tree Search. - Chiu Wo Choi; Martin Henz; Ka Boon Ng (CP, 2001)

A Software Engineering Approach to Constraint Programming Systems. - Ka Boon Ng; Chiu Wo Choi; Martin Henz (APSEC, 2002)