1. M. Richmond, The Niagara Falls hydroelectric station [Online],
http://spiff.rit.edu/classes/phys213/lectures/niagara/niagara.html
. Accessed 14 Aug 2019
2. H. Ibrahim, A. Ilinca, J. Perron, Energy storage systems—characteristics and comparisons. Renew. Sustain. Energy Rev. 12(5), 1221–1250 (2008)
3. V. de Turenne, We are not making this up: Ivanhoe Reservoir in Silver Lake covered in little black plastic balls (Los Angeles Times, Southern California, 2008)
4. Technical Analysis of Pumped Storage and Integration with Wind Power in the Pacific Northwest Final Report (2009)
5. F. Faure, Suspension Magnetique Pour Volant D’Inertie (Jun. 2003)