1. Wegst, U. G. K. & Ashby, M. F. Material selection charts for natural materials. Report No. CUED/C_EDC/TR55 (Cambridge Univ., 1997).
2. Taylor, J. D. & Layman, M. The mechanical properties of bivalve (mollusca) shell structures. Palaeontology 15, 73–86 (1972).
3. Currey, J. D. & Taylor, J. D. The mechanical behaviour of some molluscan hard tissue. J. Zool. Lond. 173, 395–406 (1974).
4. Currey, J. D. in Mechanical Properties of Biological Materials (eds Currey, J. D. & Vincent, J. F. V.) 75–97 (Cambridge Univ. Press, 1980).
5. Bøggild, O. B. The shell structure of the mollusks. K. Danske Vidensk. Selsk. Skr. 2, 232–325 ( 1930).