http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Genes of cyanobacterial origin in plant nuclear genomes point to a heterocyst-forming plastid ancestor
Oliver Deusch, Giddy Landan, Mayo Roettger, Nicole Gruenheit, Klaus V. Kowallik, John F. Allen, William Martin, Tal Dagan.