1. J. A. Ewing , The Strength of Materials (
University Press,
Cambridge, 1899), pp. 29-32.
2. VI. The phenomena of rupture and flow in solids
3. Officers of the Ordnance Department, U.S. Army, Report of Experiments on the Strength and Other Properties of Metals for Cannon, With a Description of the Machines for Testing Metals, and the Classification of Cannon in Service (
Henry Carey Baird,
Philadelphia, 1856), pp. 259–270.