@article{articlec59d1e1f,
title   = {Measurements of nitrogen fixation in fababean at different n fertilizer rates using the 'ANTPOT.15 N' isotope dilution and a-value methods},
author = {Hardarson, G and Danso, S K A and Zapata, F and Reichardt, Klaus},
year = {1991},
journal   = {Plant and Soil}
}