Introduction of trees in tropical pasture areas without altering the management of the livestock unitSilvopastoral systems for restoration of degraded tropical pasture ecosystems M H Basse Kruger , L F Ortiz C , Zavala M Guardado E Agudelo N , Sanchez C Vargas C Montenegro F Musalem M A , M E Herrera Z , Gutierrez A Escobar F Sutherland S Salazar F R , Moran B Gutierrez A Escobar F Sutherland S , M E Siregar , Yono R Cheeke P R , Haryono B Noordwijk M Van , Spurgeon D Pollisco F Chandler T , D A Hoekstra , P M Picornell , Wiersum K F , E L Hyman , Y M , Caycedo A H Giraldo L F J , M V Dalmacio , C M , H Yudodibroto , K C Tan , N Jones , J A Semana , E L Little Junior , E N Crizaldo , D H , Fenton R Roper R E Watt G R , D Diangana , N Lackhan , Moloney R A Aitken R L Gutteridge R C mag（2001）
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