http://www.semantic-systems-biology.org/
http://www.cellcycleontology.org/
http://bitbucket.org/easr/onto-toolkit
http://search.cpan.org/dist/ONTO-PERL/
The Cell Cycle Ontology: an application ontology for the representation and integrated analysis of the cell cycle process. Genome Biology 2009, 10:R58 doi:10.1186/gb-2009-10-5-r58
BioGateway: a semantic systems biology tool for the life sciences. BMC Bioinformatics 2009, 10(Suppl 10):S11doi:10.1186/1471-2105-10-S10-S11
Biological knowledge management: the emerging role of the Semantic Web technologies. Briefings in Bioinformatics 2009 10(4):392-407; doi:10.1093/bib/bbp024
Ontology Design Patterns for bio-ontologies: a case study on the Cell Cycle Ontology. BMC Bioinformatics 2008, 9(Suppl 5):S1doi:10.1186/1471-2105-9-S5-S1
ONTO-PERL: An API for supporting the development and analysis of bio-ontologies. Bioinformatics 2008 24(6):885-887; doi:10.1093/bioinformatics/btn042