@inbook{inbook9ee34946,
title   = {The potential of stable isotope , 15N and 13C, methods for determining input and turnover in soils},
author = {Andreux, F and Cerri, Carlos Clemente and Vose, P B and Vitorello, Victor Alexandre},
year = {1990},
publisher = {Elsevier},
journal   = {Nutrient Cycling in Terrestrial Ecosystems; Field Methods, Application and Interpretation}
}