Poincaré, Henri (1900), «La théorie de Lorentz et le principe de réaction», Archives Néerlandaises des Sciences Exactes et Naturelles5: 252-278.. See also the English translation.
Poincaré, Henri (1898–1913), «The Measure of Time», The foundations of science, New York: Science Press, pp. 222-234.
Poincaré, Henri (1904–1906), «The Principles of Mathematical Physics», Congress of arts and science, universal exposition, St. Louis, 19041, Boston and New York: Houghton, Mifflin and Company, pp. 604-622.