@article{articlec8b632c7,
title   = {Smooth perturbation on a classical energy function for lossy power system stability analysis},
author = {Silva, Flávio Henrique Justiniano Ribeiro da and Alberto, Luís Fernando Costa and London Junior, João Bosco Augusto and Bretas, Newton Geraldo},
year = {2005},
doi = {10.1109/pes.2003.1267417},
journal   = {IEEE Transactions on Circuits and Systems Part I : regular papers}
}