Grätz, Tilo Department I, MPI for Social Anthropology, Max Planck Society;
http://www.eth.mpg.de/cms/de/publications/working_papers/wp0054.html (Any fulltext)
Grätz, T. (2003). Sharing and sustaining: the thrusts of friendship among young Artisanal gold miners in Northern Benin (West Africa). Max Planck Institute for Social Anthropology Working Papers, 54.