BERMAN, H. M., FENG, Z., SCHNEIDER, Bohdan, WESTBROOK, J., ZARDECKI, C. The Nucleic Acid Database (NDB). In: ROSSMANN, M. G., ARNOLD, E., eds. International Tables for Crystallography. Crystallography of Biological Macromolecules. F. Dordrecht: Kluwer Academic, 2001, s. 657-682.