1. Paul Ehrenfest on the Necessity of Quanta (1911): Discontinuity, Quantization, Corpuscularity, and Adiabatic Invariance Author Navarro, Luis and Pérez, Enric Published 2004
2. Note by the Communicator of Two Papers, by J. Barrow-Green and by K. G. Andersson, on Poincaré Author Lützen, Jesper Published 1994
4. The Controversy Between Colin MacLaurin and George Campbell Over Complex Roots, 1728-1729 Author Mills, Stella Published 1983