Valuation compressions in VCG-based combinatorial auctions
P. Dütting, M. Henzinger, M. Starnberger, ACM Transactions on Economics and Computation 6 (2018).

Auctions for heterogeneous items and budget limits
P. Dütting, M. Henzinger, M. Starnberger, ACM Transactions on Economics and Computation 4 (2015).