Imbò, P., and G. . Gandini. “Electro Magnetic Wireline Retrievable-Surface Controlled Subsurface Safety Valve: A New Backup For Surface Controlled Subsurface Safety Valve To Avoid WorkOver”. Journal of Petroleum Research and Studies, vol. 2, no. 3, Dec. 2011, pp. 1-21, doi:10.52716/jprs.v2i3.47.