1. Hammer B: Orbital fractures: diagnosis, operative treatment, secondary corrections. Seattle: Hogrefe & Huber, 1995
2. Hammer B, Kunz C, Schramm A, deRoche R, Prein J: Repair of complex orbital fractures: technical problems, state-of-the-art solutions and future perspectives. Ann Acad Med Singapore 28(5):687–691, 1999. Review
3. Bookstein FL: Morphometric tools for landmark data, geometry and biology. Cambridge: Cambridge University Press, 1991/97
4. Zollikofer CPE, Ponce de León M: Virtual reconstruction, a primer in computer-assisted paleontology and biomedicine. New York: Wiley-Interscience, 2005
5. Dryden IL, Mardia KV: Statistical shape analysis. Chichester: Wiley, 1998