Saeed, W. and Tawfeeq, L. 2017. Voltage Collapse Optimization for the Iraqi Extra High Voltage 400 kV Grid based on Particle Swarm Optimization. Iraqi Journal for Electrical and Electronic Engineering. 13, 1 (Jul. 2017), 17–31. DOI:https://doi.org/10.37917/ijeee.13.1.3.