@article{article35803db9,
title   = {Using thermal units for estimating critical period of weed competition in off-season maize crop},
author = {Lopez Ovejero, R. F. and Garcia y Garcia, A. and Carvalho, S. J. P. de and Christoffoleti, Pedro Jacob and Dourado Neto, Durval and Martins, F. and Nicolai, M.},
year = {2005},
doi = {10.1081/PFC-200034196},
journal   = {Journal of Environmental Science and Health. Part B}
}