@article{articlee3fa9f23,
title   = {Organic matter in the Peruvian headwaters of the Amazon:: compositional evolution from the Andes to the lowland Amazon mainstem},
author = {Aufdenkampe, Anthony K and Mayorga, Emilio and Hedges, John I and Llerena, Carlos and Quay, Paul D and Gudeman, Jack and Krusche, Alex Vladimir and Jeffrey E. Richey b},
year = {2007},
doi = {10.1016/j.orggeochem.2006.06.003},
journal   = {Organic Geochemistry}
}