@inproceedings{Lehmann99, author = "Daniel J. Lehmann and Liaden Ita O'Callaghan and Yoav Shoham", title = "Truth revelation in approximately efficient combinatorial auctions", booktitle = "{ACM} Conference on Electronic Commerce", pages = "96--102", year = "1999", url = "citeseer.ist.psu.edu/lehmann99truth.html" }