@inproceedings{1572105,
 author = {Macdonald, Craig and Ounis, Iadh},
 title = {On perfect document rankings for expert search},
 booktitle = {SIGIR '09: Proceedings of the 32nd international ACM SIGIR conference on Research and development in information retrieval},
 year = {2009},
 isbn = {978-1-60558-483-6},
 pages = {740--741},
 location = {Boston, MA, USA},
 doi = {http://doi.acm.org/10.1145/1571941.1572105},
 publisher = {ACM},
 address = {New York, NY, USA},
 }