Leos-Rodríguez, J. A.; Serrano-Páez, A.; Salas-González, J. M.; Ramírez-Moreno, P. P.; Sagarnaga-Villegas, M. Characterization of Livestock Producers and Livestock Production Units That Are Beneficiaries of the Livestock Productivity Incentives Program (PROGAN) in México. ASYD 2008, 5, 213-230.