Lanchester's laws
N-Squared Law: An Examination of one of the Mathematical Theories behind the Dreadnought Battleship Naval Weapons of the World
Dupuy, Col T N (1979). Numbers, Predictions and War. Macdonald and Jane's.
Helmbold, Robert L. (14 February 1961a). Lanchester Parameters for Some Battles of the Last Two Hundred Years. CORG Staff Paper CORG-SP-122.
Helmbold, Robert L. (1961b). "Lanchester's Equations, Historical Battles, and War Games". Proceedings of the Eighth Military Operations Research Society Symposium, 18–20 October 1961.
Helmbold, Robert L. (12 May 2021). The Key to Victory: Machine Learning the Lessons of History. ISBN 9781668525289.
Lanchester, Frederick W. (1916). Aircraft in Warfare.
Niall J. MacKay Lanchester combat models, Mathematics Today, 2006, Vol 42/5, pages 170–173.

External links: "Kicking Butt By the Numbers: Lanchester's Laws", a Designer's Notebook column by Ernest Adams in the Gamasutra webzine