1. Abdelmgeid Amin, A. (2008). Using a query expansion technique to improve document retrieval. International Journal Information Technologies and Knowledge, 2(4), 343–348.
2. Amati, G., & van Rijsbergen, C. J. (2002). Probabilistic models of information retrieval based on measuring the divergence from randomness. ACM Transactions on Information Systems (TOIS), 20(4), 357–389.
3. Amati, G., Carpineto, C., & Romano, G. (2004). Query difficulty, robustness, and selective application of query expansion. In Advances in Information Retrieval, 26th European Conference on IR Research, ECIR 2004, Proceedings, Springer, Lecture Notes in Computer Science, 2997, pp 127–137
4. Arampatzis, A. (2001). Unbiased S-D threshold optimization, initial query degradation, decay, and incrementality, for adaptive document filtering. In Proceedings of The Tenth Text REtrieval Conference, TREC 2001, National Institute of Standards and Technology (NIST), 250, pp 596–603.
5. Arampatzis, A., & Robertson, S. (2011). Modeling score distributions in information retrieval. Information Retrieval, 14(1), 26–46.