@article{Varian_2007,
title={Position auctions},
volume={25},
ISSN={0167-7187},
url={http://dx.doi.org/10.1016/j.ijindorg.2006.10.002},
DOI={10.1016/j.ijindorg.2006.10.002},
number={6},
journal={International Journal of Industrial Organization},
publisher={Elsevier BV},
author={Varian,
Hal R.},
year={2007},
month=dec,
pages={1163–1178} }