1. Simple points, topological numbers, and geodesic neighborhoods in cubic grids;Bertrand;Pattern Recognit. Lett.,1994
2. On P-simple points;Bertrand;C. R. Acad. Sci., Ser. 1 Math.,1995
3. On critical kernels;Bertrand;C. R. Math.,2007
4. Completions and Simplicial Complexes;Bertrand,2012
5. New structures based on completions;Bertrand,2013