Rieger, Joachim Algorithms and Complexity, MPI for Informatics, Max Planck Society;
https://rdcu.be/dxvD6 (Publisher version)
Rieger, J. (1995). Generic Evolutions of Edges on Families of Diffused Greyvalue Surfaces. Journal of Mathematical Imaging and Vision, 5(3), 207-217. doi:10.1007/BF01248372.