Hastik, R., Geitner, C. and Neuburger, M. 2013. Amazonian Dark Earths in Bolivia? A soil study of anthropogenic ring ditches near Baures (eastern Llanos de Mojos). ERDKUNDE. 67, 2 (Jun. 2013), 137–149. DOI:https://doi.org/10.3112/erdkunde.2013.02.03.