In a thought-provoking essay for the Winter 2020 issue of the Naval War College Review, Don Stoker and Craig Whiteside argue against the utility of two terms: gray-zone conflict and hybrid war. I believe the opposite.
"Research & Debate—It’s a Gray, Gray World,"
Naval War College Review: Vol. 73
, Article 10.
Available at: https://digital-commons.usnwc.edu/nwc-review/vol73/iss3/10