BioTop and ChemTop - Top-Domain Ontologies for Biology and Chemistry. - Holger Stenzhorn; Stefan Schulz 001; Elena Beisswanger; Udo Hahn; László van den Hoek; Erik M. van Mulligen (ISWC (Posters & Demos), 2008)

Alignment of the UMLS semantic network with BioTop: methodology and assessment. - Stefan Schulz 001; Elena Beisswanger; László van den Hoek; Olivier Bodenreider; Erik M. van Mulligen (Bioinform., 2009)