Diaz-Gonzalez, F.; Bianchi, F.D.; Sumper, A.; Gomis-Bellmunt, O. "Control of a flywheel energy energy-storage-harvesting-and-catalysis system for power smoothing in wind power plants" IEEE Transactions on Energy Conversion 29, 1, pp. 204 - 214. 2014 DOI: 10.1109/TEC.2013.2292495