BRENDA, the enzyme database: updates and major new developments. - Ida Schomburg; Antje Chang; Christian Ebeling; Marion Gremse; Christian Heldt; Gregor Huhn; Dietmar Schomburg (Nucleic Acids Res., 2004)

The BRENDA Tissue Ontology (BTO): the first all-integrating ontology of all organisms for enzyme sources. - Marion Gremse; Antje Chang; Ida Schomburg; Andreas Grote; Maurice Scheer; Christian Ebeling; Dietmar Schomburg (Nucleic Acids Res., 2011)