@article{Afshani.Chan.DCG09,
 author = {Peyman Afshani and Timothy M. Chan},
 title = {On approximate range counting and depth},
 journal = {Discrete and Computational Geometry},
 year = {2009},
 pages = {3--21},
 volume = {42},
 doi = {http://doi.acm.org/10.1007/s00454-009-9177-z},
 note = {prelinimary version at SOCG'07}
}