Slow drag in a granular medium. Albert, R.; Pfeifer, M. A.; Barabási, A.; and Schiffer, P. Physical review letters, 82(1):205, 1999.
Slow drag in a granular medium [link]Paper  bibtex   
@article{albert_slow_1999,
	title = {Slow drag in a granular medium},
	volume = {82},
	url = {http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.82.205},
	number = {1},
	urldate = {2014-07-20TZ},
	journal = {Physical review letters},
	author = {Albert, R. and Pfeifer, M. A. and Barabási, A.-L. and Schiffer, P.},
	year = {1999},
	pages = {205}
}
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