Paper  bibtex   

@article{xu_numerical_1997,
	title = {Numerical simulation of the gas-solid flow in a fluidized bed by combining discrete particle method with computational fluid dynamics},
	volume = {52},
	url = {http://www.sciencedirect.com/science/article/pii/S000925099700081X},
	number = {16},
	urldate = {2014-06-26TZ},
	journal = {Chemical Engineering Science},
	author = {Xu, B. H. and Yu, A. B.},
	year = {1997},
	pages = {2785--2809}
}