“…Agriculture and food (Babu et al, 2000), (Badini et al, 2007), (Bakker et al, 1998), (Bontkes and van Keulen, 2003), (Bosma et al, 1999), (Brossier and Jager, 1984), (Cabanilla et al, 2005), (Delgado and McIntire, 1982), (Dijk, 1997), (Groot and Coulibaly, 1994), (Haefele et al, 2003), (Hengsdijk and van Ittersum, 2002), (Hengsdijk and van Ittersum, 2003), (Hyman, 1991), ( Jaeger and Matlon, 1990), (Kaya et al, 2000), (Kruseman and Bade, 1998), (Langyintuo et al, 2005), (Roncoli et al, 2007), (Samake´, 2003), (Staatz et al, 1989), (Van Duivenbooden, 1993), (Van Duivenbooden, 1999), (Van Duivenbooden and Veeneklaas, 1993), (Vitale and Sanders, 2005). Agriculture and food (Babu et al, 2000), (Badini et al, 2007), (Bakker et al, 1998), (Bontkes and van Keulen, 2003), (Bosma et al, 1999), (Brossier and Jager, 1984), (Cabanilla et al, 2005), (Delgado and McIntire, 1982), (Dijk, 1997), (Groot and Coulibaly, 1994), (Haefele et al, 2003), (Hengsdijk and van Ittersum, 2002), (Hengsdijk and van Ittersum, 2003), (Hyman, 1991), …”