Strategic Studies Institute. October 16, 2014.
Currently, there is no internationally accepted definition of when hostile actions in cyberspace are recognized as attacks, let alone acts of war. Although many of the challenges associated with this conundrum are common with those of the traditional domains, land, sea, and air, how should senior policymakers and decisionmakers address the unique vexations related to the complex and dynamic character of conflict in the cyberspace domain?
http://www.strategicstudiesinstitute.army.mil/pubs/display.cfm?pubID=1229 [PDF format, 119 pages].