T. J. Hammons, J. C. Boyer, S. R. Conners, M. Davies, M. Ellis, M. Fraser, E. A. Holt, and J. Markard, "Renewable energy alternatives for developed countries," IEEE Transactions on Energy Conversion, Vol. 15, No. 4, December 2000, pp. 481-493.
 C. Boccaletti, G. Fabbri, J.Marco, and E. Santini, "An Overview on Renewable Energy Technologies for Developing Countries: the case of Guinea Bissau," International Conference on Renewable Energies and Power Quality, Santander, Spain, 2008.
 D. N. Nkwetta, M. Smyth, and Vu Van Thong, "Electricity supply, irregularities, and the prospect for solar energy and energy sustainability in Sub-Saharan Africa," Journal of renewable and sustainable energy, Vol. 02, 23 March 2010, pp. 16.
 Subiyanto, A. Mohamed, and M. Hannan, "Intelligent maximum power point tracking for PV system using Hop?eld neural network optimized fuzzy logic controller," Energy and Buildings, Vol. 51, 2012, pp. 29-38.
 T. Niknam, A. M. Ranjbar, A.R. Shirani, “Impact of Distributed Generation on Volt/Var Control in Distribution Network,” Proceedings of Power Tech Conference of the IEEEPES, Bolongna, 23-26 June 2003, pp. 7.
 M. B. Liu, C. A. Canizares and W. Huang, “Reactive Power and Voltage Control in Distribution Systems with Limited Switching Operations”, IEEE Transactions on Power Systems, Vol. 24, No. 2, May 2009, pp. 889-899.
 Y.-Y. Hong, K.-L. Pen, “Optimal VAR Planning Considering Intermittent Wind Power using Markov Model and Quantum Evolutionary Algorithm,” IEEE Transactions on Power Delivery, Vol. 25, No. 4, Oct 2010, pp. 2987-2996.
 Y.-Y. Hong and Y.-F. Luo, “Optimal VAR Control Considering Wind Farms using Probabilistic Load Flow and Gray-Based Genetic Algorithms”, IEEE Transactions on Power Delivery, Vol. 24, No. 3, July 2009, pp. 1441-1449.
 M.E. Baran and I. M. El-Markabi, “A Multi agent based Dispatching Scheme for Distributed Generators for Voltage Support on Distribution Feeders”, IEEE Transactions on Power Systems, Vol. 22, No.1, Feb. 2007, pp. 52-59.
 D. H. Spatti, I. N. da Silva, W. F. Usida, R. A. Flauzino, “Real-Time Voltage Regulation in Power Distribution using Fuzzy Control”, IEEE Transactions on Power Delivery, Vol. 25, No. 2, April 2010, pp. 1112-1123.
 F. A. Viawan, “Voltage Control and Voltage Stability of Power Distribution Systems in the Presence of Distributed Generation”, PhD Thesis, Chalmers University of Technology, G?teborg, Sweden, 2008.
 P. N. Vovos, A. E. Kiprakis, A. R. Wallace and P. Harrison, “Centralized and Distributed Voltage Control: Impact on Distributed Generation Penetration”, IEEE Transactions on Power Systems, Vol. 22, No.1, Feb. 2007, pp. 476-483
 Biruk Tessema and Gary G. Yen, “A Self Adaptive Penalty Function Based Algorithm for Constrained Optimization,” IEEE Congress on Evolutionary Computation, Oklahoma State University, Stillwater, 2006, pp 246-253.