@article {Holtzman2010a,
	title = {Frictional granular mechanics: a variational approach},
	journal = {Int. J. Numer. Methods Eng.},
	year = {2010},
	pages = {1259{\textendash}1280},
	keywords = {effective elastic moduli, grain-scale simulations, intergranular friction, micromechanics, principle of least work, quasi-static model},
	doi = {10.1002/nme},
	url = {http://onlinelibrary.wiley.com/doi/10.1002/nme.2727/abstract},
	author = {Holtzman, R and Silin, DB and Patzek, TW}
}
