1. Ashburner M, Ball CA, Blake JA, Botstein D, Butler H, Cherry JM, Davis AP, Dolinski K, Dwight SS, Eppig JT, Harris MA, Hill DP, Issel-Tarver L, Kasarskis A, Lewis S, Matese JC, Richardson JE, Ringwald M, Rubin GM, Sherlock G (2000) Gene ontology: tool for the unification of biology. The Gene Ontology Consortium. Nat Genet 25(1):25–29
2. Bard J, Rhee SY, Ashburner M (2005) An ontology for cell types. Genome Biol 6(2):R21
3. Bard JB (2005) Anatomics: the intersection of anatomy and bioinformatics. J Anat 206(1):1–16
4. Carnap R (1950) Empiricism, Semantics, and Ontology. Revue Internationale de Philosophie 4:20–40. On the web: http://www.ditext.com/carnap/carnap.html
5. Chabalier J, Mosser J, Burgun A (2007) Integrating biological pathways in disease ontologies. Stud Health Technol Inform 129(Pt 1):791–795