Strey, S., Boy, J., Strey, R., Welpelo, A., Schönenberg, R., Schumann, C. and Guggenberger, G. (2017) “Digging deeper: the value of deep soil carbon for potential REDD+ projects in tropical forest communities in Amazonia”, ERDKUNDE, 71(3), pp. 231–239. doi: 10.3112/erdkunde.2017.03.05.