Tài liệu tham khảo

WikiPedia: Chi Gai dầu http://pubs.nrc-cnrc.gc.ca/cgi-bin/rp/rp2_gene_e?m... http://www.ville-ge.ch/musinfo/bd/cjb/africa/detai... http://books.google.com/books?id=fxoJPVNKYUgC&pg=P... http://content.karger.com/produktedb/produkte.asp?... http://www.newscientist.com/article/mg18725175.200 http://wwwlib.umi.com/dxweb/gateway http://www.gbe-bund.de/gbe10/abrechnung.prc_abr_te... http://www.bio.fsu.edu/faculty-anderson.php http://classics.mit.edu/Herodotus/history.4.iv.htm... http://waynesword.palomar.edu/termlf1.htm