P-graph-a graph model for anomaly checking of knowledge bases. - Eng Lian Lim; John McCallum; Kwok-Hung Chan (TAI, 1990)

COGNITO: An Extended Computational Theory of Cognition. - Taizan Chan; Yam San Chee; Eng Lian Lim (Intelligent Tutoring Systems, 1992)

Production-Graph: a Graph Theoretical Model for Checking Knowledge Base Anomalies. - Eng Lian Lim; John McCallum; Kwok-Hung Chan (Int. J. Artif. Intell. Tools, 1992)