Bartl, Karin; Gómez, Carlos A.; Hess, Hans Dieter; Mayer, Andrea Corina; Kreuzer, Michael; Holmann, Federico José. 2007. Costs and benefits of traditional and improved dry season feeding systems of dairy cattle for smallholder farmers in the Peruvian Andes [abstract]. In: Deininger, Andreas; Hoffmann, Anne. (eds.). Utilisation of diversity in land use systems: Sustainable and organic approaches to meet human needs: Book of abstracts, Tropentag 2007: Conference on international agricultural research for development, Cuvillier Verlag Göttingen. University of Kassel, Centre for International Rural Development, Witzenhausen, DE. p. 1.