@inproceedings{umass:robust2005,
year = {2005},
title = {UMass at Robust 2005: Using Mixtures of Relevance Models for Query Expansion},
booktitle = {The Fourteenth Text REtrieval Conference (TREC 2005) Notebook},
author = {Donald Metzler and Fernando Diaz and Trevor Strohman and W. B. Croft}
}