@inproceedings{inproceedings0cf84d0e,
title   = {An extended energy function for voltage collapse analysis considering voltage dependent load models},
author = {Guedes, Renato Braga de Lima and Martins, André Christovão Pio and Alberto, Luís Fernando Costa and Bretas, Newton Geraldo},
year = {2003},
publisher = {IEEE},
booktitle   = {IEEE Bologna Power Tech Conference}
}