G. Snell
- On the Stability of Arches, with Practical Methods for Determining, According to the Pressures to which They Will Be Subjected, the Best Form of Section, or Variable Depth of Voussoir, for Any Given Intrados or Extrados. In: Minutes of the Proceedings of the Institution of Civil Engineers, v. 5, n. 1846 ( 1846). (1846):