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| Ramírez Sulvarán, Jesús Arturo, Sigarroa Rieche, Alina Katil and Del Valle Vargas, Rómulo Alberto Characterization of Cocoa (Theobroma cacao L.) Farming Systems in the Norte de Santander Department and Assessment of Their Sustainability. Rev. Fac. Nac. Agron. Medellín, Jan 2014, vol.67, no.1, p.7177-7187. ISSN 0304-2847
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