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Kallah, Muh. S; Bale, J. O; Abdullahi, U. S; Muhammad, I. R; Lawal, R (April 10, 2000). "Nutrient composition of native forbs of semi-arid and dry sub-humid savannas of Nigeria". Animal Feed Science and Technology. 84 (1): 137–145. doi:10.1016/S0377-8401(99)00131-5. ISSN0377-8401.