@inproceedings{inproceedingsab2d3334,
title   = {Identifying critical sets in state estimation using Gram matrix},
author = {Almeida, Madson Cortes de and Asada, Eduardo Nobuhiro and Garcia, Ariovaldo Verandio},
year = {2009},
publisher = {IEEE},
booktitle   = {IEEE Bucharest PowerTech Conference}
}