@book{5433,
	author = {Matuttis, Hans-Georg and Chen, Jian},
	title = {Understanding the discrete element method :},
	publisher = {John Wiley & Sons,},
	year = {c 2014.},
	address = {Singapore :},
	url = {https://onlinelibrary.wiley.com/doi/pdfdirect/10.1002/9781118567210?download=true}
}