1. The Cambridge Structural Database
2. The Inorganic Crystal Structure Database (ICSD)—Present and Future
3. PAULING FILE, Binaries Edition , ed. P. Villars , K. Cenzual , J. L. C. Daams , F. Hulliger , T. B. Massalski , H. Okamoto , K. Osaki , A. Prince and S. Iwata , ASM International , Materials Park , 2002 , http://paulingfile.com/
4. P. Villars and K.Cenzual , Pearson's Crystal Data: Crystal Structure Database for Inorganic Compounds, Release 2017/18 ( ASM International , Materials Park, OH , 2017 ), http://www.crystalimpact.com/pcd/
5. The RCSB Protein Data Bank: views of structural biology for basic and applied research and education