Information Retrieval with Distributed Databases: Analytic Models of Performance. - Robert M. Losee; Lewis Church Jr. (IEEE Trans. Parallel Distributed Syst., 2004)

Are two document clusters better than one? The Cluster Performance Question for information retrieval. - Robert M. Losee; Lewis Church Jr. (J. Assoc. Inf. Sci. Technol., 2005)

Combinatoric Models of Information Retrieval Ranking Methods and Performance Measures for Weakly-Ordered Document Collections. - Lewis Church Jr. (2010)