Alemu B, Melaku S and Prasad N K 2007: Effects of varying seed proportions and harvesting stages on biological compatibility and forage yield of oats (Avena sativa L.) and vetch (Vicia villosa R.) mixtures. Livestock Research for Rural Development.
Volume 19, Article #12. Retrieved , from http://www.lrrd.org/lrrd19/1/alem19012.htm