@article{article443fc677,
title   = {Site variability effect on field measurement of symbiotic nintrogen fixation using the 'ANTPOT. 15N' isotope dilutionmethod},
author = {Reichardt, Klaus and Hardarson, G and Zapata, F and Kirda, C and Danso, S K A},
year = {1987},
journal   = {Soil Biology & Biochemistry}
}