@article{v008a005,
 author = {Shaddin Dughmi and Tim Roughgarden and Mukund Sundararajan},
 title = {Revenue Submodularity},
 year = {2012},
 pages = {95--119},
 doi = {10.4086/toc.2012.v008a005},
 publisher = {Theory of Computing},
 journal = {Theory of Computing},
 volume = {8},
 number = {5},
 URL = {http://www.theoryofcomputing.org/articles/v008a005},
}