Applegate, Scott Douglas, Christopher L. Carpenter, and David C. West. “Searching for Digital Hilltops: A Doctrinal Approach to Identifying Key Terrain in Cyberspace.” Joint Force Quarterly, no. 84 (1st Quarter 2017): 18-23.
The proposed definition of "key terrain'" is : "Any locality, or area, the seizure or retention of which affords a marked advantage to either combatant". According to the author of this article, the "key terrain" is different from the notion of "critical asset", defined as "a spacific entity that is of such extraordinary importance that its incapacitation or destruction would have a very serious, debilitating effect on the ability of a nation to continue to function effectively".