@unpublished{publication-18370,
	author={Ledoit, Olivier and Wolf, Michael},
	institution={University of Zurich},
	issn={1664-705X},
	number=327,
	pages=34,
	series={Working paper series / Department of Economics},
	title={Shrinkage estimation of large covariance matrices: keep it simple, statistician?},
	year=2021,
}