1. Simple BM25 extension to multiple weighted fields;Robertson,2004
2. Effective retrieval of structured document;Wilkinson;In Res. Dev. Inf. Retrieval,1994
3. Probabilistic models of indexing and searching;Robertson;In Proc. Of the 3rd ACM SIGIR,1980
4. The probability ranking principle in IR;Robertson;J. Doc.,1977
5. Some simple effective approximations to the 2-poisson model for probabilistic weighted retrieval;Robertson;In Proc. 17th ACM SIGIR,1994