@article {1936,
	title = {Causes of Ambiguity Aversion: Known Versus Unknown Preferences},
	journal = {Journal of Risk and Uncertainty},
	volume = {36},
	year = {2008},
	pages = {225-243},
	author = {Trautmann, Stefan T. and Vieider, Ferdinand M. and Wakker, Peter P.}
}
