@article{paperid:1010782,
author = {سپهر سلطانی and Pariz, Naser and Ghazi, Reza},
title = {Extending the perturbation technique to the modal representation of nonlinear systems},
journal = {Electric Power Systems Research},
year = {2009},
volume = {79},
number = {8},
month = {March},
issn = {0378-7796},
pages = {1209--1215},
			numpages = {6},
keywords = {Perturbation technique
Modal Series
Normal Form method
Unified power flow controller (UPFC)},
}