Andrew Byde Terence Kelly Yunhong Zhou Robert Endre Tarjan Efficiently Generating k-Best Solutions to Procurement Auctions. 68-84 2009 AAIM http://dx.doi.org/10.1007/978-3-642-02158-9_8 conf/aaim/2009 db/conf/aaim/aaim2009.html#BydeKZT09