ALIYU, A.; SHELLENG, B.; USMAN, J. FARM LEVEL EFFICIENCY OF RUBBER AS A PERENNIAL CROP USING COBB-DOUGLASS PRODUCTION FRONTIER. International Journal of Research -GRANTHAALAYAH, [S. l.], v. 6, n. 7, p. 65–75, 2018. DOI: 10.29121/granthaalayah.v6.i7.2018.1284. Disponível em: https://www.granthaalayahpublication.org/journals/granthaalayah/article/view/IJRG18_A07_1518. Acesso em: 24 apr. 2024.