@article{articleaac958fb,
title   = {Plant response to mechanical resistance and air-filled porosity of soils under conventional and no-tillage system},
author = {Silva, Álvaro Pires da and Imhoff, S. Del C. and Kay, B.},
year = {2004},
doi = {10.1590/s0103-90162004000400016},
journal   = {Scientia Agricola}
}