T. J. Jankun-Kelly, Song Zhang, A. C. Callan-Jones, Robert A. Pelcovits, V. A. Slavin, and David H. Laidlaw. Tensor Visualization and Defect Detection for Nematic Liquid Crystals using Shape Characteristics. In Visualization and Processing of Tensor Fields: Advances and Perspectives, pages 213-238. Springer-Verlag, 2009.