@inproceedings{inproceedings9f191023,
title   = {Variable productivity in earthwork services of roadwork's in Brazil: the divergence between the opinions of different budgeting manuals},
author = {Cruvinel, Dornelas Ricardo and Souza, Ubiraci Espinelli Lemes de},
year = {2012},
publisher = {Antac},
booktitle   = {Encontro Nacional de Tecnologia do Ambiente Construído}
}