Manivanh N, Preston T R and Thuy N T 2016: Protein enrichment of cassava (Manihot esculenta Crantz) root by fermentation with yeast, urea and di-ammonium phosphate. Livestock Research for Rural Development. Volume 28, Article #222. Retrieved , from http://www.lrrd.org/lrrd28/12/noup28222.html