Sánchez-Cruz, H., Sossa-Azuela, H., Braumann, U.-D. and Bribiesca, E. 2013. The Euler-Poincaré Formula Through Contact Surfaces of Voxelized Objects. Journal of Applied Research and Technology. 11, 1 (Feb. 2013). DOI:https://doi.org/10.1016/S1665-6423(13)71515-3.