Schmitz, C., Biewald, A., Lotze-Campen, H., Popp, A., Dietrich, J. P., Bodirsky, B., Krause, M., Weindl, I. (2012): Trading more food: implications for land use, greenhouse gas emissions, and the food system. - Global Environmental Change, 22, 1, 189-209.https://doi.org/10.1016/j.gloenvcha.2011.09.013