1. For example, http://www.oism.org/pproject/s33p36.htm.
2. For example, http://www.ingentaconnect.com/content/els/01406701/1996/00000037/00000002/art88015.
3. For example, http://www.apec-vc.or.jp/e/modules/tinyd00/index.php?id=101&kh_open_cid_00=15.
4. For example, http://www.hempusa.org/articles/industrial-hemp.html.
5. Plant Physiological Ecology;Lambers,1998