@article{article388539e7,
title   = {Effects of variation in nonlinear damping coefficients on the parametric vibration of a cantilever beam with a lumped mass},
author = {Silva, Demian Gomes and Varoto, Paulo Sérgio},
year = {2008},
doi = {10.1155/2008/185351},
journal   = {Mathematical Problems in Engineering}
}