@article { SKMR:1998,
	title = {Visualizing Nonlinear Vector Field Topology},
	journal = {IEEE Transactions on Visualization and Computer Graphics},
	volume = {4},
	number = {2},
	year = {1998},
	month = {April{\textendash}June},
	pages = {109{\textendash}116},
	author = {Gerik Scheuermann and Kr{\"u}ger, H. and Menzel, M. and Rockwood, A.}
}
