@INPROCEEDINGS{sigir04-TKD,  
  AUTHOR    = {Christos Tryfonopoulos and Manolis Koubarakis and Yannis Drougas},  
  TITLE     = "{Filtering Algorithms for Information Retrieval Models with Named Attributes and Proximity Operators}",  
  BOOKTITLE = "{Proceedings of the 27th Annual International ACM SIGIR Conference}",  
  YEAR      = {2004},  
  PAGES     = {313-320},  
  MONTH     = {July},  
  ADDRESS   = "{Sheffield, UK}",
}