Nagypál, G., Motik, B., & Meersman, R. (2003). A Fuzzy Model for Representing Uncertain, Subjective, and Vague Temporal Knowledge in Ontologies. Springer.

Nagypál, G., B. Motik, and R. Meersman. A Fuzzy Model for Representing Uncertain, Subjective, and Vague Temporal Knowledge in Ontologies. Springer, 2003.

Nagypál, G., et al. A Fuzzy Model for Representing Uncertain, Subjective, and Vague Temporal Knowledge in Ontologies. Springer, 2003.