@article{article405b88df,
title   = {A FEM procedure based on positions and unconstrained vectors applied to non-linear dynamic of 3D frames},
author = {Coda, Humberto Breves and Paccola, Rodrigo Ribeiro},
year = {2011},
doi = {10.1016/j.finel.2010.11.001},
journal   = {Finite Elements in Analysis and Design}
}