1. Akbarinia, R., Pacitti, E., & Valduriez, P. (2007). Best position algorithms for top-k queries. In Proceedings of the 33rd international conference on very large data bases, VLDB ’07 (pp. 495–506).
2. Balke, W., Güntzer, U., & Kießling, W. (2010). On real-time top k querying for mobile services. On the Move to Meaningful Internet Systems 2002: CoopIS, DOA, and ODBASE pp. 125–143
3. Bast, H., Majumdar, D., Schenkel, R., Theobald, M., & Weikum, G. (2006). IO-Top-k: Index-access optimized top-k query processing. In Proceedings of the 32nd international conference on very large data bases, VLDB Endowment, VLDB ’06 (pp. 475–486).
4. Fagin, R. (1999). Combining fuzzy information from multiple systems. Journal of Computer and System Sciences, 58, 83–99.
5. Fagin, R. (2002). Combining fuzzy information: An overview. ACM SIGMOD Record, 31(2), 109–118.