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BOOKS OF REFERENCE.
- Bôcher, Maxime. "A Bit of Mathematical History," Bulletin of the N. Y. Math. Soc., Vol. II., No. 5.
- Cayley, Arthur. Report on the Recent Progress of Theoretical Dynamics. 1857.
- Glazebrook, R. T. Report on Optical Theories. 1885.
- Rosenberger, F. Geschichte der Physik. Braunschweig, 1887-1890.