@inbook {672, title = {Visualizing Symmetric Indefinite 2D Tensor Fields Using the Heat Kernel Signature}, booktitle = {Visualization and Processing of Higher Order Descriptors for Multi-Valued Data}, year = {2015}, pages = {257{\textendash}267}, publisher = {Springer}, organization = {Springer}, author = {Zobel, Valentin and Reininghaus, Jan and Hotz, Ingrid} }