@techreport{macdonald06sigir,
 author = {Macdonald, C. and Ounis, I.},
 title = {Combining Fields in Known-Item Email Search},
 booktitle="{Proceedings of the 29th annual international ACM SIGIR conference on Research and Development in Information Retrieval}",
 year = {2006},
 location = {Seattle, Washington, USA},
}