Generalized Vector Space Model in Information Retrieval. - S. K. Michael Wong; Wojciech Ziarko; P. C. N. Wong (SIGIR, 1985)

On Extending the Vector Space Model for Boolean Query Processing. - S. K. Michael Wong; Wojciech Ziarko; Vijay V. Raghavan 001; P. C. N. Wong (SIGIR, 1986)

On Modeling of Information Retrieval Concepts in Vector Space. - S. K. Michael Wong; Wojciech Ziarko; Vijay V. Raghavan 001; P. C. N. Wong (ACM Trans. Database Syst., 1987)

Extended Boolean query processing in the generalized vector space model. - S. K. Michael Wong; Wojciech Ziarko; Vijay V. Raghavan 001; P. C. N. Wong (Inf. Syst., 1989)