@article{article48255e31,
title   = {Soil structure evaluated by gamma-ray attenuation},
author = {Oliveira, J. C. M. de and Appoloni, C R and Coimbra, M M and Reichardt, Klaus and Bacchi, Osny Oliveira Santos and Ferraz, E and Silva, S C and Galvão Filho, W},
year = {1998},
journal   = {Soil & Tillage Research}
}