@TechReport{Collaborative_Joins_in_a_Pervasive_Computing_Environment,
  author = "Filip  Perich and Anupam  Joshi and Yelena  Yesha and Tim  Finin",
  title = "{Collaborative Joins in a Pervasive Computing Environment}",
  month = "August",
  year = "2003",
  institution = "University of Maryland, Baltimore County",
}