1. AOAC - Association of Official Analytical Chemistry. 1990. Official methods of analysis. 15th ed. AOAC International, Arlington, VA.
2. Methane emission, protozoa and methanogens counts in sheep fed coconut oil or a Brazilian tannin-rich plant (Mimosa casealpineaefolia);Abdalla;Microbial Ecology in Health and Disease,2007
3. Bateman, J. V. 1970. Determinación de óxido crómico en alimento y heces - (H2SO4+ HClO4); la digestibilidad aparente; prueba de digestibilidad. p.404-450. In: Nutrición animal. Manual de métodos analíticos. Bateman, J. V., ed. Herrero Hermano, México.
4. Use of condensed tannin extract from quebracho trees to reduce methane emissions from cattle;Beauchemin;Journal of Animal Science,2007
5. Nutritional management for enteric methane abatement: a review;Beauchemin;Australian Journal of Experimental Agriculture,2008