@techreport{gruyer:hal-01021534, TITLE = {{Using lotteries in auctions when buyers collude}}, AUTHOR = {Gruyer, Nicolas}, URL = {https://enac.hal.science/hal-01021534}, YEAR = {2005}, MONTH = Oct, KEYWORDS = {collusion ; cartel ; optimal auction ; mechanism design}, PDF = {https://enac.hal.science/hal-01021534/file/232.pdf}, HAL_ID = {hal-01021534}, HAL_VERSION = {v1}, }