1. J. Chomicki, Semantic optimization of preference queries, in: International Symposium on Constraint Databases, Paris, France, June 2004, Lecture Notes in Computer Science, vol. 3074, Springer, Berlin, pp. 133–148.
2. J. Chomicki, Querying with intrinsic preferences, in: International Conference on Extending Database Technology (EDBT), Lecture Notes in Computer Science, vol. 2287, Springer, Berlin, 2002. pp. 34–51.
3. Preference formulas in relational queries;Chomicki;ACM Trans. Database Systems,2003
4. W. Kießling, Foundations of preferences in database systems, in: International Conference on Very Large Data Bases (VLDB), 2002, pp. 311–322.
5. W. Kießling, G. Köstler, Preference SQL-design, implementation, experience, in: International Conference on Very Large Data Bases (VLDB), 2002, pp. 990–1001.