@article{GiovannucciEtAlJAAMAS,
  author =        {Andrea Giovannucci and Jes\'us Cerquides and Ulle Endriss and Juan A.~Rodr\'\i guez-Aguilar},
  title =         {A Graphical Formalism for Mixed Multi-Unit Combinatorial Auctions},
  journal =       {Journal of Autonomous Agents and Multiagent Systems},
  volume =        {20},
  number =        {3},
  pages =         {342--368},
  year =          {2010},
  doi =           {10.1007/s10458-009-9085-x}
}