Luis Gustavo Nonato Antonio Castelo José Eduardo Prado Pires De Campos Helton Hideraldo Bíscaro Rosane Minghim Tetrahedron Topological Characterization with Application in Volumetric Reconstruction. 189-216 2005 11 International Journal of Shape Modeling 2 http://dx.doi.org/10.1142/S0218654305000773 db/journals/ijsm/ijsm11.html#NonatoCCBM05