Media type: E-Article Title: Challenges to optimal power flow Contributor: Momoh, J.A.; Koessler, R.J.; Bond, M.S.; Stott, B.; Sun, D.; Papalexopoulos, A.; Ristanovic, P. imprint: Institute of Electrical and Electronics Engineers (IEEE), 1997 Published in: IEEE Transactions on Power Systems Language: Not determined DOI: 10.1109/59.575768 ISSN: 0885-8950 Origination: Footnote: