The CATH database: an extended protein family resource for structural and functional genomics.
Frances M. G. PearlC. F. BennettJames E. BrayAndrew P. HarrisonNigel J. MartinAdrian J. ShepherdIan SillitoeJanet M. ThorntonChristine A. OrengoPublished in: Nucleic Acids Res. (2003)