@techreport{pfaffelmoser2012probability,
	title={Probability Distributions for Gradient Directions in Uncertain 3D Scalar Fields},
	author={Pfaffelmoser, T. and Mihai, M. and Westermann, R.},
  	institution={Technische Universit{\"a}t M{\"u}nchen},
  	year={2012}
}