@proceedings{SIGIR:98,
  title={Proceedings of the 21st Annual International {ACM} {SIGIR} Conference on Research and Development in Information Retrieval},
  editor={W. Bruce Croft and Alistair Moffat and Cornelis J. van Rijsbergen and Ross Wilkinson and Justin Zobel},
  address={New York},
  publisher={ACM},
  booktitle={Proceedings of the 21st Annual International ACM SIGIR Conference on Research and Development in Information Retrieval},
  entrydate=19980324,
  year=1998,
}