@article{articlece059f7c,
title   = {Comparative tests of seismic sources and geophones aiming a shallow reflection seismic investigation in urban areas},
author = {Bhokonok, Oleg and Diogo, Liliana Alcazar and Prado, Renato Luiz},
year = {2006},
doi = {10.1590/s0102-261x2006000100006},
journal   = {Revista Brasileira de Geografia}
}