Shi, K., Theisel, H., Weinkauf, T., Hauser, H., Hege, H.-C., & Seidel, H.-P. (2006). Path Line Oriented Topology for Periodic 2D Time-Dependent Vector Fields. In EUROVIS 2006 : Eurographics / IEEE VGTC Symposium on Visualization (pp. 139-146). Aire-la-Ville, Switzerland: Eurographics.