1. Elementary Concepts of Topology;Alexandroff,1961
2. Optimization of length measurements for isotropic distance transformations in three dimensions;Beckers;Comput. Vision Graphics Image Process. – Image Understanding,1992
3. Logic Minimization Algorithms for VLSI Synthesis;Brayton,1984
4. Computing skeletons in three dimensions;Borgefors;Pattern Recognition,1999
5. Regular Polytopes;Coxeter,1974