@inproceedings{doubleauctions,
	author = {Riccardo Colini Baldeschi and Bart de Keijzer and Stefano Leonardi and Stefano Turchetta},
	title = {Approximately Efficient Double Auctions with Strong Budget Balance},
	booktitle = {Proceedings of the 27th Annual {ACM-SIAM} Symposium on Discrete Algorithms (SODA)},
	pages = {1424--1443},
	year = {2016},
	publisher = {SIAM}
}