@InProceedings{cerquides07a,
  author =	 {Jes\'{u}s Cerquides and Ulle Endriss and Andrea
                  Giovannucci and Juan A. Rodr\'{i}guez-Aguilar},
  title =	 {Bidding Languages and Winner Determination for Mixed
                  Multi-unit Combinatorial Auctions},
  booktitle =	 {Proceedings of the Twentieth International Joint
                  Conference on Artificial Intelligence},
  pages =	 {1221--1227},
  year =	 2007,
  abstract =	 {We introduce a new type of combinatorial auction
                  that allows agents to bid for goods to buy, for
                  goods to sell, and for transformations of goods. One
                  such transformation can be seen as a step in a
                  production process, so solving the auction requires
                  choosing the sequence in which the accepted bids
                  should be implemented. We introduce a bidding
                  language for this type of auction and analyse the
                  corresponding winner determination problem.},
  url = 	 {http://jmvidal.cse.sc.edu/library/cerquides07a.pdf}
}