@unpublished{publication-5628,
	author={Koenig, Markus and Zweifel, Peter},
	institution={University of Zurich},
	number={No. 411},
	series={Working paper series / Socioeconomic Institute},
	title={Willingness-to-pay Against Dementia: Effects of Altruism Between Patients and Their Spouse Caregivers},
	year=2004,
}