1. Bathe, K.: Finite Element Procedures. Prentice-Hall, Upper Saddle River (1996)
2. Schneiders, R.: Octree-based hexahedral mesh generation. Int. Journal of Comp. Geom. & Applications 10(4), 383–398 (2000)
3. Parrish, M.: A Selective Approach to Comformal Refinement of Unstructured Hexahedral Meshes, MS Thesis, Brigham Young Univ., Utah (2007)
4. Garland, M., Heckbert, P.: Surface Simplification Using Quadric Error Metrics, Carnegie Melon University (1997), http://graphics.cs.uiuc.edu/%7Egarland/papers/quadrics.pdf
5. Hoppe, H., DeRose, T., Duchamp, T., McDonald, J., Stuetzle, W.: Mesh Optimization, University of Washington (1993), http://citeseer.ist.psu.edu/cache/papers/cs/797/ftp:zSzzSzftp.cs.washington.eduzSztrzSz1993zSz01zSzUW-CSE-93-01-01.pdf/hoppe93mesh.pdf