@unpublished{publication-6522,
	author={Seuken, Sven and Meulpolder, Michel and Epema, Dick H. J. and Parkes, David C. and Pouwelse, Johan A. and Tang, Jie},
	number=1,
	series={Harvard University},
	title={Work Accounting Mechanisms: Theory and Practice},
	year=2011,
}