@article{v003a009,
 author = {Maria-Florina Balcan and Avrim Blum},
 title = {Approximation Algorithms and Online Mechanisms for Item Pricing},
 year = {2007},
 pages = {179--195},
 doi = {10.4086/toc.2007.v003a009},
 publisher = {Theory of Computing},
 journal = {Theory of Computing},
 volume = {3},
 number = {9},
 URL = {http://www.theoryofcomputing.org/articles/v003a009},
}