"Government Accountability Office, GPS Disruptions: Efforts to Assess Risks to Critical Infrastructure and Coordinate Agency Actions Should Be Enhanced (GAO-14-15) (Nov. 6, 2013) (full-text)."@en . . . . . "Government Accountability Office, GPS Disruptions: Efforts to Assess Risks to Critical Infrastructure and Coordinate Agency Actions Should Be Enhanced (GAO-14-15) (Nov. 6, 2013) (full-text)."@en . "GPS Disruptions: Efforts to Assess Risks to Critical Infrastructure and Coordinate Agency Actions Should Be Enhanced"@en . .