The Plant Ontology Database: a community resource for plant structure and developmental stages controlled vocabulary and annotations. Nucleic Acids Research, 36(Database issue), D449-54. (Original work published 2008 Jan C.E.)
. (2008). Gramene: a bird's eye view of cereal genomes. Nucleic Acids Research, 34(Database issue), D717-23. (Original work published 2006 Jan 1 C.E.)
. (2006). The Gene Ontology in 2010: extensions and refinements. Nucleic Acids Research, 38(Database issue), D331-5. (Original work published 2010 Jan C.E.)
. (2010).