POINCARÉ, Leçons sur la théorie de l'élasticité, 1892

First edition.
Lectures given by Henri Poincaré and written by Borel and Drach on the mathematical foundations of elasticity problems. Foundations which will serve as the basis for Poincaré's development of an elastic theory of light in which the propagation of light is described by the elastic compression-decompression of the ether.