@article{article096929bc,
title   = {Penetration resistance in a latosol under different moisture and penetration speeds},
author = {Molina Junior, Walter Francisco and Piedade, Sônia Maria de Stefano and Amaral, Juarez Rennó},
year = {2013},
doi = {10.1590/S0034-737X2013000500016},
journal   = {Revista Ceres}
}