The following publications are possibly variants of this publication:
- Practical and Intuitive Basis for Tensor Field Processing with Invariant Gradients and Rotation TangentsGordon L. Kindlmann, Carl-Fredrik Westin. In Santiago Aja-Fernández, Rodrigo de Luis García, Dacheng Tao, Xuelong Li, editors, Tensors in Image Processing and Computer Vision. Advances in Pattern Recognition, pages 299-314, Springer, 2009. [doi]
- Tensor Invariants and their GradientsGordon L. Kindlmann. In Joachim Weickert, Hans Hagen, editors, Visualization and Processing of Tensor Fields. Mathematics and Visualization, pages 215-224, Springer, 2006. [doi]