@Article{vv-2003,
  title = 	 {Combinatorial auctions},
  author = 	 {Sven de Vries and Rakesh V. Vohra},
  journal = 	 {INFORMS J. Comput.},
  url= {http://joc.journal.informs.org/cgi/content/abstract/15/3/284},
  year = 	 2003,
  volume = 	 15,
  number = 	 3,
  pages = 	 {284--309}}