@article{article83075b83,
title   = {A demonstration of dry and viscous damping of an oscillating pendulum},
author = {Zonetti, Luiz Fernando da Costa and de Camargo, Andrea Simone Stucchi and Sartori, José and Sousa, D F de and Nunes, Luiz Antônio de Oliveira},
year = {1999},
doi = {10.1088/0143-0807/20/2/004},
journal   = {European Journal of Physics}
}