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Food and Agriculture Organization of the United Nations. (1995). Flavors and Fragrances of Plant Origin.  Chapter 9: Olibanum (frankincense), Myrhh andopopanax resins and oils [online]. Available: <http://www.fao.org/documents/show_cdr.asp?url_file=/docrep/V5350E/V5350E00.htm> 

Frenssen, Delusion. (2005). Britannica Encyclopedia.   

Gilliland, H.B. (1952). The Vegetation of Eastern British Somaliland.  The Journal of Ecology, Vol. 40 No.1 Feb. 1952 pg(91-124).

Lemenih, M. and Teketay D.  (2003) Frankincense and Myrhh Resources of Ethiopia: I Distribution, production, opportunities for dryland development and resource needs.  Ethiopian Journal of Science.  Jun. 1, 2003. v26 ilpg63(10). 

Leon, Wiersema. (1999). World Economic Plants: A Standard Reference.  Boca Raton, Fl: CRC Press  

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Ogbazghi, Woldeselassie. (2001).  The distribution and regeneration of Boswellia papyrifera (Del.) Hochst. In Eritrea.  Wageningen University dissertation no. 2930.  Jan 23, 2001. Available: <http://library.wur.nl/wda/abstracts/ab2930.html>

Progressive Interventions .  Frankincense our Friend [online].  Available: <www.pinterventions.org/somali_frankincense.htm> and  <http://herbal gram.org/products/hmbc/default.asp?h=Frankincense>. 

Ram HYM and Shivanna KR et al. (2005) Reproductive biology of Boswellia serrata, the source of salai guggul, an important gum-resin.  Botanical Journal of the Linnean Society. Jan. 2005.

Sepasal Database. Boswellia sacra Flueck, Burseraceae [online].  Available: <http://www.rbgkew.org.uk/ceb/sepasal/bsacra.htm>.

Van Wyck, Ben-Erik and Wink, Michael.  Medicinal Plants of the World.  Timber Press: Oregon 2004.