@conference {Nie02:Integrating,
	title = {Integrating Logical Operators in Query Expansion in VSM},
	booktitle = {Workshop on Mathematical/Formal Methods in Information Retrieval, 25th ACM-SIGIR, Tampere, Finland},
	year = {2002},
	month = {aug},
	pdf = {http://rali.iro.umontreal.ca/rali/sites/default/files/publis/sigir-formal-workshop.2002.ps},
	author = {Jian-Yun Nie and Fuman Jin}
}
