O'Donovan P B, Soomro F M, Wagenaar J P, Shafiq-ur-Rehman and Bukhari F A 1997:
Urea treatment of straw: a farmer - friendly system improved upon in Balochistan.
Livestock Research for Rural Development. Volume 9, Article #48.
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, from http://www.lrrd.org/lrrd9/5/pak951.htm