Paper  doi  bibtex   

@article{fan_kinematics_2013,
	title = {Kinematics of monodisperse and bidisperse granular flows in quasi-two-dimensional bounded heaps},
	volume = {469},
	issn = {1364-5021, 1471-2946},
	url = {http://rspa.royalsocietypublishing.org/cgi/doi/10.1098/rspa.2013.0235},
	doi = {10.1098/rspa.2013.0235},
	language = {en},
	number = {2157},
	urldate = {2015-10-27TZ},
	journal = {Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences},
	author = {Fan, Y. and Umbanhowar, P. B. and Ottino, J. M. and Lueptow, R. M.},
	month = jul,
	year = {2013},
	pages = {20130235--20130235}
}