1. Ashburner, M., Ball, C. A., Blake, J. A., Botstein, D., Butler, H., Cherry, J. M., Davis, A. P., Dolinski, K., Dwight, S. S., Eppig, J. T., Harris, M. A., Hill, D. P., Issel-Tarver, L., Kasarskis, A., Lewis, S., Matese, J. C., Richardson, J. E., Ringwald, M., Rubin, G. M., & Sherlock, G. (2000). Gene ontology: Tool for the unification of biology. The gene ontology consortium. Nature Genetics, 25(1), 25–29.
2. Beisswanger, E., Schulz, S., Stenzhorn, H., & Hahn, U. (2008). BioTop: An upper domain ontology for the life sciences. A description of its current structure, contents and interfaces to OBO ontologies. Applied Ontology, 3(4), 205–212.
3. Bittner, T. (2004). Axioms for parthood and containment relations in bio-ontologies. In U. Hahn (Ed.), Proceedings of the KR 2004 workshop on formal biomedical knowledge representation, Whistler (Volume 102 of CEUR workshop proceedings).
4. Buddensiek, F. (2006). Die Einheit des Individuums. Eine Studie zur Ontologie der Einzeldinge. Berlin: Walter de Gruyter.
5. Casati, R., & Varzi, A. (1999). Parts and places. The structure of spatial representation. Cambridge: MIT.