@article{400635,
      author = {Tanner, Heather J.},
      url = {http://library.usi.edu/record/400635},
      title = {Families, friends, and allies Boulogne and politics in  northern France and England, c. 879-1160 / [electronic  resource] :},
      publisher = {Brill,},
      recid = {400635},
      pages = {xxiv, 399 p. :},
      address = {Leiden ;},
      year = {2004},
}