1. The Shell Structure of the Mollusks.;Bøggild;Danske Selskabs Skrifter.,1930
2. Nouvelle étude sur les perles naturelles et sur les perles de culture.;Boutan;Ann. Sci. nat. Zool.,1923
3. Spherulitic Crystallization as a Mechanism of Skeletal Growth in the Hexacorals;Bryan;Proc. Roy. Soc. Queensland
4. On the Microscopic Structure of Shells.;Carpenter;Parts 1 and 2. Rep. Brit. Ass.,1844
5. The Inorganic Constituents of Marine Invertebrates.;Clarke;U.S. Geol. Survey Prof. Paper,1917